1978-1988 GM G-Body Frame Notch Kit, Weld In, UMI Performance UMI’s P/N 3061 G-body frame notch kit allows for narrowing the rear upper frame rails on the G-body for installation of a wider tire. Laser cut 1/8” premium steel follows the frame contour (with some... MSRP: Was: Price: Now: $109.99 Quick view Add to Cart SKU: 3061