Product details:

Rear Frame Notch Kit Fits 1978-1988 GM G-Body Six-Piece Kit Installing this Kit Allows for Wider Wheels & Tires 1/8 in. Thick Steel 64530 Rear Frame Notch Kit for 1978-1988 GM G-Body Cars is designed for narrowing the rear frame rails over the rear axle to allow for wider wheels & tires to be installed. The notch plates are precision cut to follow the contour of the factory frame rail and come with filler plates to enclose the ends. Cutting, fabricating, and welding are required. Notch Kit Features: Six-piece kit: (2) Notch plates 29.630 in. overall length and (4) End filler plates Laser-cut from 1/8 in. thick mild steel Notch plates are made oversize to allow for slight frame variances