Up for Buy-It-Now is a new old stock engine clutch driven plate, GM part number 458629.  This item was obtained from an old service garage and is not a newly remanufactured part.  According to my GM manuals, this is used on the following models and years:

1976 Chevrolet, Body code F Camaro, 8 cylinder w/ M.T.
1977-1979 Chevrolet, Body code F Camaro, 8 cylinder (305, 350) w/ M.T. (M20)
1982 Chevrolet, Body code F Camaro..8 cylinder (305H)

1976-1979 Chevrolet, Body code X Nova..8 cylinder w/ M.T.
1978-1979 Chevrolet, Body code A  Malibu, El Camino, Monte Carlo..8 cylinder (305, 350), w/ M.T.
1978-1979 Chevrolet...6 cylinder All w /231, (Except body code H)

1977-1979 Pontiac, Body code F Firebird..8 cylinder (305)
1977-1979 Pontiac, Body code X Ventura, Phoenix (305)
1978 Pontiac, Body code F Firebird..8 cylinder (305L)
1980 Pontiac..6 cylinder, all w/ 229
1980-1981 Pontiac...6 cylinder All w/ 232 (Except Body code H)

1956 Corvette
1963-1968 Corvette

1977 Oldsmobile, Body code X Omega..8 cylinder (305 w/ M.T.)
1978-1979 Oldsmobile, Body code A Cutlass..8 cylinder w/ 305, w/ M.T.
1978-1981 Oldsmobile... 6 cylinder, All w/ 231, (Except body code H)

  The disc has an outside diameter of 10 13/32" and has a hub spline count of 10.  I opened the box for the first time to inspect and take pictures. The plate is in brand new, never used condition and is free of any damage.  There are a few spots of extremely minor spots surface rust from many years of shelf storage.  May or may not need a light polishing up before installation.  The original GM box is in good condition.
  Please feel free to E-mail me questions.  International bidders are always welcome.  Thanks for looking!!