1987 GMC Sierra Bolt Patterns

5 Lug Pattern

5x127mm = 5x5 inches

6 Lug Pattern

6x139.7mm = 6x5.5 inches

Year/Make/Model/Option	Bolt Patterns
1987 GMC Sierra 2wd	5x127mm (5x5")
1987 GMC Sierra 4wd Pick-up	6x139.7mm (6x5.5")