| Year/Make/Model | Bolt Patterns |
| 1978 GMC C20 | 6x139.7mm (6x5.5") |
| 1979 GMC C20 | 6x139.7mm (6x5.5") |
| 1980 GMC C20 | 6x139.7mm (6x5.5") |
| 1981 GMC C20 | 6x139.7mm (6x5.5") |
| 1982 GMC C20 | 6x139.7mm (6x5.5") |
| 1983 GMC C20 | 6x139.7mm (6x5.5") |
| 1984 GMC C20 | 6x139.7mm (6x5.5") |
| 1985 GMC C20 | 6x139.7mm (6x5.5") |
| 1986 GMC C20 | 6x139.7mm (6x5.5") |
| 1987 GMC C20 | 6x139.7mm (6x5.5") |
| 1988 GMC C20 | 6x139.7mm (6x5.5") |
