You can google them! I think the search words are 1/2 scale or 1/4 scale 32 Ford bodies. I've seen their website several years ago, only cost about $400 buck back then, unless that is a different company you are showing than what I saw....
There used to be a guy in Independence MO that popped those out (probably bootleg, but I'm not sure). He also did trike bodies and other kart bodies. I can't remember his name to save my life, though. If I think of it, I'll post it here.
There is a guy in the Back Of HEMMINGS magazine. He sells parts for this Go Kart.. Name is "MUNCHKIN MOTORS" You Can Google him also.. I have this Go Kart.. I got It 13 years ago and Rebuilt it 2 years ago. Now we do car shows.. It has a 10 hp Tecemseh Headlights, Tail lights, Horn , Wood Dash, 5 speeds forward, Neutral, Reverse, I added a real windshield and custom interior. .. Tail lights are of a Harley , Headlights are Running lights off a Harley. Email me with Questions [email protected]