The cast aluminum front clamps that said Panzer were used by several manufacturers back then. Holbrecht (sp) was an aftermarket 4x4 parts manufacturer that did bed bars, bumper overbars, etc... I think many home brewed cars started with bought clamps and built from there for a straight reference point going back. The fiberglass looks like Hi-jumper, but the cage looks like a Chenowth Wedge. There was a guy up in the bay area named Robert Johnson who built cars that looked like this that raced 1/2-1600 in VORRA back then. Don't know if he is related to the current Robert Johnson who races the 11 car that lives in the Sierra Foothills or not. I don't think it is the same guy as he isn't that old.