Please factor in 3-5 Business Days for Processing and Assembly.
WHAT'S INCLUDED:
Each RokBlokz mud flap set for the 5th generation Sierra 2500/3500 HD comes with 4 Flaps (Front and Rear), ROKBLOKZ Fender Trim cap kit, stainless steel & rust-resistant mounting hardware and instructions to fit factory hole locations. *Does require trimming of the fender to mount bracket and get the most clearance.
WHAT IT FITS:
2020+ 5th Gen GMC Sierra 2500HD / 3500HD
DOESN'T FIT:
Not Confirmed for the GMC Sierra 2500 AT4X AEV Edition
GMC Sierra 1500
Any Chevrolet models or previous generations of GMC HD Trucks
Any other GMC Model or truck
2 STYLES TO CHOOSE FROM:
-RALLY FLAPS were designed for those who like to keep a stock wheel set up but want some paint protection. If your tires rub, you will need our hi clearance step-back kit.
-HIGH CLEARANCE STEP-BACK FLAPS mount inside the wheel well and step back past the fender for those who run lifts, larger tires and/or higher offset wheels that poke past the fenders and are tight on space inside the wheel well. SEEN ON THE TRUCK IN THE PHOTOS.
Please note that this kit was designed on a stock vehicle. When modifying fenders, wheels or suspension, you may have to modify the flaps to work with those changes. Please email us before ordering if you have any questions.
COLOR OPTIONS:
RokBlokz Mud Flaps are available in BLACK, RED, YELLOW, GREY, DEEP BLUE, BRIGHT BLUE, ORANGE, LIME GREEN, OLIVE DRAB, PINK, TAN, and DEEP PURPLE. Colors other than Black are considered Custom as they are made to order.
*NO RETURNS ON COLORED FLAPS
Screen resolution, lighting, and surroundings all affect how colors present. If you are questioning how well the color will match, please order a color sample HERE.
Please note that a shopping cart quantity of 1 = a whole kit (4 flaps)
FREE SHIPPING in the contiguous U.S.
International shipping is available. You can see pricing in the shopping cart. Please note that International Taxes and Duties are the responsibility of the buyer.
We are constantly making small improvements to our products, so yours might be a little different from what you see in photos and videos.
Your 2020+ GMC Sierra 2500HD & 3500HD is built to haul, tow, and tackle tough terrain—but those wide, aggressive tires can throw rocks, mud, and road debris that chip paint and beat up your truck’s body. The Rokblokz Step-Back Mud Flap Kit is designed to stop the mess before it does damage, keeping your Sierra looking sharp while adding rugged functionality.
Unlike thin rubber or brittle plastic flaps, Rokblokz are CNC laser-cut from our proprietary polymer blend. This material strikes the perfect balance of flexibility and rigidity—tough enough to take hits from rocks without cracking, yet firm enough to hold shape at highway speeds.
They won’t warp in scorching heat, crack in freezing temps, or fall apart under stress. Whether you’re running backcountry trails, towing heavy loads, or just driving daily, these flaps are made to perform in every condition.
And because the flaps are only as strong as what holds them on, our mounting brackets are built to last too. Made from stainless steel and finished with a two-layer powder coat, they’ve got double the protection against corrosion. The stainless underneath prevents rust, while the reinforced powder coat shrugs off chips and wear—so your setup stays solid season after season.
To tie it all together, the kit includes our Fender Trim Cap—a precision-fit piece designed to replace the bulky OEM splash guard trim. It creates a seamless, finished look while still protecting exposed edges when you pull the liner back for larger tires. No raw cuts or unfinished wheel wells—just a factory-clean appearance that matches your Sierra’s bold styling.
✔ Durable, Flexible Polymer – Resists cracking, warping, and fading
✔ Enhanced Protection – Shields paint, fenders, and undercarriage from rocks, mud, and spray
✔ Fender Trim Cap Included – Replaces OEM trim for a clean, finished edge
✔ Step-Back Design – Provides extra clearance for larger tire setups
✔ Heavy-Duty Mounting Brackets – Stainless steel with a dual-layer powder coat for maximum rust and chip resistance
✔ Easy Install – Uses factory mounting points with included stainless hardware
✔ Made in the USA – Designed, built, and tested for Sierra owners who demand more
Whether you’re on the jobsite, off the grid, or out on the highway, the Rokblokz Step-Back Mud Flap Kit with Fender Trim Cap is built to keep your Sierra 2500/3500 HD protected and looking good.
Protect your investment. Upgrade your Sierra with Rokblokz today.
At RokBlokz, we’re always looking for vehicles in or near Provo, UT to help us refine and perfect our mud flap designs. If you’re local and want to see if your vehicle qualifies, check out our list of needed models here. Participating owners receive special perks and the chance to be part of our design process!
We offer shipping to most countries around the world. Shipping times may vary depending on the destination country and shipping method selected at checkout. We typically process orders within 1-2 business days of receiving payment, and we will send you a tracking number once your order has been shipped.
Standard Shipping:
Our standard shipping option is available for most countries and typically takes between 7-14 business days to arrive, depending on the destination.
Express Shipping:
We offer express shipping to select countries. This shipping option typically takes between 3-7 business days to arrive, depending on the destination.
Customs and Fees:
Please be aware that some countries may charge customs duties, taxes, or other fees on imported goods. These fees are not included in our prices or shipping costs, and are the responsibility of the customer. We are not responsible for any delays or additional fees incurred due to customs clearance processes.
Delivery Time - Domestic
Typically, your package should reach you within 2-9 days of placing an order.
The answer to this question depends on what shipping service is used or selected. Included shipping is most often done through USPS Priority or FedEx which is not a guaranteed service but estimated at 2-4 days depending on how far away from Utah it is traveling. For larger packages, we use FedEx/UPS GROUND. These services are estimated at 3-5 days and 5-7 days respectively.
We do offer expedited shipping options, but please remember that those estimations are not including the processing time, which is usually 24 hours or less except on weekends. However, those times can be affected by weather.
Delivery Time - International
Internationally, this depends on multiple factors such as destination, carrier and selected service. Our normal handling time is about 24 hours, except on weekends and Holidays when we are not in the office. With any shipping service, domestic or international, weather can cause delays in shipping. This type of delay is with the Carrier.
FedEx is a great option for most parts of the world. The fee includes clearance through customs and is pretty fast. In most cases it is around 3-5 days for delivery. Please note that you will still be responsible for any import taxes.
UPS is a great option to Canada, but quite pricey for other parts of the world. The standard service is estimated at about 9 business days. UPS offers faster services that can be delivered in as little as one day. If an expedited service is selected, please note that it is only guaranteed if UPS processes it through Customs. If you assign a different agent, the service is no longer a guaranteed service. There is an additional clearance fee as well as import taxes.
***Please note that with all international shipments, import taxes are the responsibility of the buyer.
We try to help when delays in delivery happen, but we cannot issue a refund on any portion of shipping unless the carrier approves a refund on shipping charges paid on our end.
All packages ship to the address that was entered on our web site, www.rokblokz.com. This is the address customers save as their shipping to location when the account is set-up. Please note that if you use PayPal to pay, we do not use the address that you save/use in PayPal to ship your order(s). Our fulfillment team does its best to adapt order changes when requested well ahead of the start of the following business day; however we are unable to guarantee that updates will be made prior to shipping. You may send us an email, enter order notes on the web site or through PayPal; however this does not mean that changes can or will be made. We encourage you to double check your order before hitting submit and to update your www.rokblokz.com account to avoid processing delays.
Full Warranty/Return policy can be found here.
