Rexka M4.2 U-Nut and 25mm Hex Screw Kit — 20 Sets for GM Fender Liners, Bumpers, Grilles (Black)

Rexka's 20-piece M4.2-1.41 U-nut and matching M4.2x25mm hex screw set is a direct-fit hardware kit for many GM fender liners, bumper covers, grilles and splash shields.

This replacement kit groups 20 extruded U-type retaining nuts and 20 multipurpose hex screws to fasten thin panels and trim on GM vehicles. The U-nuts accept M4.2 (approx. #8) screws and clamp panel thicknesses from 0.65mm up to 3.8mm, while the 25mm hex-head screws provide consistent thread engagement and a loose washer for broader load distribution. The set lists many GM part numbers it replaces, helping you match the original-style fasteners when repairing or reassembling fenders, wheelhouses, headlights, or bumper covers.

Which GM parts and models does this kit replace?

The Rexka kit corresponds to multiple GM OE fastener part numbers used across Chevrolet, GMC, Buick and Cadillac models. It includes both U-nuts and screws that are specified as replacements for common original hardware, so you can restore factory fit and function without hunting multiple individual pieces.

• Replaces GM nuts: 11513599, 11513700, 11515842, 11516397, 25619753, 5480765, 94515252.
• Replaces GM screws: 11547421, 11508233, 11515429 and several related OE numbers.
• Fits many models: Chevrolet, GMC, Buick and Cadillac vehicles including Silverado, Tahoe, Traverse, Enclave, XT5, CT4/CT5 and more.

How do these U-nuts and screws perform during installation?

Each U-nut is extruded with a locking thread that grips an M4.2 screw and clamps panel material securely. The screws have a 7mm hex head with a loose 17mm outer-diameter washer to spread load and reduce stress on plastic or thin metal liners. Together they simplify panel alignment and resist loosening from vibration.

• U-nut panel range: 0.65mm–3.8mm (0.025"–0.150").
• Center hole-to-edge distance: 9.5mm (3/8") for correct fit on standard slots and flanges.
• Screw details: 4.2-1.41 x 25mm, black finish, hex head for quick torque application.

What applications and locations on the vehicle are these intended for?

This set is designed for trim and underbody attachments where OEM-style U-nuts are used—commonly fender liners, bumper covers, grilles, wheelhouses, splash shields and headlight or fog light mounts. Use them when replacing damaged clips or when reassembling panels during repair or aftermarket part installation.

• Common installs: fender liners, bumper covers, splash shields, wheelhouses.
• Also used for: grille and headlight mounting points and interior trim reinforcements.
• Vehicle compatibility covers many GM sedans, crossovers, trucks and SUVs.

Any fitment checks or cautions before purchase?

Measure the original fastener and panel thickness to confirm this kit matches your vehicle’s fasteners. Although the kit covers many referenced GM part numbers, variations exist across model years and optional trim packages, so compare the dimensions and OE numbers listed before ordering.

• Confirm screw diameter and length (M4.2 x 25mm) against originals.
• Check U-nut panel thickness range (.025"–.150") to ensure proper clamping.
• Compare the listed GM replacement numbers to your vehicle’s parts list.

Who is this for: technicians, DIY mechanics and body-shop owners who need a compact, OEM-style fastener kit for GM vehicles. If you’re replacing damaged clips on fender liners, bumper covers, wheelhouses or reattaching trim and lights, this Rexka set provides matched U-nuts and screws to restore factory-like retention without bulk purchases of multiple separate parts. Always verify part numbers and dimensions to ensure exact fit for your model and year.