UMI 73-87 GM C10 Frame Notch KitUMIs bolt in frame notch kit improves axle clearance on lowered trucks. The 6415 is essential when lowering more than 6. It features strong 3 16 laser cut steel construction, quality hardware and poly bumpstops. Although notching of the factory frame is required, the UMI design does not require any cutting of your valuable bed reinforcement rails. UMIs exclusive inner support plate doubles as an easy to use template. Gloss black powder coat protects