RockTrix for Precision European - 4pc 1.25" Wheel Adapters 5x4.75 to 5x5.5 (CHANGES BOLT PATTERN) Spacers, 12x1.5 studs for Chevy Camaro Corvette S10 GMC Jimmy Pontiac Firebird GTO (5x120 to 5x139.7) [CHANGES BOLT PATTERN] These Adapter Spacers will only work for you if your vehicle is 5x4.75" (5x120.65) bolt pattern AND your wheels are 5x5.5" (5x139.7) bolt pattern. See description for other important information. [APPLICATIONS] Buick, Cadillac, Chevy, Chevrolet, GMC, & Pontiac vehicles with 5x4.75" (5x120.65) Bolt Pattern and 12x1.5 Threaded Studs [SPECIFICATIONS] Pack of 4. 1.25" (32mm) Thickness | 73.1mm Hub Bore | 12x1.5 Threaded Studs/Nuts [BOLT PATTERN INFORMATION] 5x4.75" (5x120.65) Vehicle Bolt Pattern | 5x5.5" (5x139.7) Wheel Bolt Pattern [MANUFACTURING] CNC Machined to exact specifications from Aerospace Billet Aluminum. Undergoes anodizing process to prevent corrision. Includes pre-installed heat treated 10.9 grade studs.