UMI Performance 82-02 GM F-Body Rear Coilover Brackets Bolt InUMI Performance, Inc is proud to introduce our P N 2045 GM F Body bolt in rear coilover bracket kit. This kit allows installation of a true double rod end performance shock in place of the standard stud type shock. P N 2045 can be used with standard type springs as well as most aftermarket lowering springs. An innovative, TIG welded lower bracket holds the shock in double shear and works with standard axle mounts as well as with most common relocation