Sorry to say, you might have to resort to finding a used one from a member or the junkyard. If I'm not mistaken, this motor was used in various other GM cars.
According to RockAuto, these cars listed, apparently used the same wiper motor.
BUICK | CENTURY | 1984-1986 |
BUICK | REGAL | 1984-1987 |
CHEVROLET | CAMARO | 1984-1987 |
CHEVROLET | CELEBRITY | 1984-1986 |
CHEVROLET | CORVETTE | 1984-1988 |
CHEVROLET | EL CAMINO | 1984-1987 |
CHEVROLET | MONTE CARLO | 1984-1987 |
GMC | CABALLERO | 1984-1987 |
OLDSMOBILE | CUTLASS CIERA | 1984-1986 |
OLDSMOBILE | CUTLASS SALON | 1985-1987 |
OLDSMOBILE | CUTLASS SUPREME | 1984-1987 |
PONTIAC | 6000 | 1984-1986 |
PONTIAC | BONNEVILLE | 1984-1986 |
PONTIAC | FIREBIRD | 1984-1987 |
PONTIAC | GRAND PRIX | 1984-1987 |