This was the very first time Mattel offered a Hot Wheels Club and there were 3 mail in only chrome cars. Those so-called "Club Kit Cars" were the Heavy Chevy Club Kit, Boss Hoss Silver Special, and the King 'Kuda. All three Club Kit Cars had black-stripes and assorted numbers on the door. They came with either a black or a white interior.
The Heavy Chevy Club Kit has come out in the following 1/64 scale versions: