These are the passenger side door window tracks from a 67 Buick Wildcat convertible. 
This will fit these full size cars:

Buick- 67-68 2 door hardtop and convertible except Riviera

Cadillac- 67-68 all 2 door

Chevy- 67 all 2 door, and 68 Impala 2 door hardtop and convertible

Olds- 67-68 2 door hardtop and convertible

Pontiac- 67 convertible, and 68 2 door hardtop and convertible except Grand Prix