All new GM Metric frame sections. IMCA and USRA approved. Available as front, rear, or complete front/rear frame kit. Race-ready modifications already made to frames. Identical dimensional specs to 78-88 GM Metric frame mounting points. .118-inch thick mild steel front frame rail sections. .120-inch thick mild steel rear frame rail sections. .095-inch thick 2x4 midframe rails (included with front frame and complete frame kits only) Front upper control arm mounts and rear spring/shock mounts included, must be finish welded. Front and rear frames feature dimple stops and alignment holes for assembly and welding ease. Don't Build Your Next Hobby Stock Car With a 30-Plus-Year-Old Frame With the last production GM Metric chassis frame hitting the road in 1988 it is no doubt getting tougher to find a suitable chassis for a competitive Hobby Stock race car build. Rust, accident damage, and more claim these GM Metric chassis frames every day. Our IMCA and USRA Hobby Stock rules approved GM Metric chassis Hobby Stock frame is the perfect answer to your next Hobby Stock chassis build! It is available as a weld together front frame stub (with control arm/shock mounts and midframe rails included), weld together rear frame stub (with spring/shock mounts included), or complete weld together frame kit (front stub, rear stub, midframe rails, and shock mounts), perfect for Hobby Stock chassis builders. Designed in-house at Speedway Motors, these new mild steel frame stubs solve the growing problem of trying to source good used GM Metric chassis frames for your Hobby Stock cars. These are designed around factory frame dimensions, yet most of the modifications and updates you would have to make to a stock frame are already expertly handled and approved by IMCA and USRA Hobby Stock rules