This mount is for the following vehicles:

1973-1987 Chevy/GMC 4x4 1500, 2500 and 3500
1973 - 1991 Chevy 4X4 1500 Blazer, 1500 Suburban, and 2500 Suburban
1973 - 1991 GMC 4X4 1500 Jimmy, 1500 Suburban, & 2500 Suburban

Parts List and Installation Instructions.