RockTrix for Precision European - 2pc 1" Thick Wheel Adapters Spacers 5x5 to 5x4.5 (CHANGES BOLT PATTERN) with 1/2"x20 Studs/Nuts for many GMC Buick Chevy (5x127 to 5x114.3) 25mm [CHANGES BOLT PATTERN] These Adapter Spacers will only work for you if your vehicle is 5x5" (5x127) bolt pattern AND your wheels are 5x4.5" (5x114.3) bolt pattern. See description for other important information. [APPLICATIONS] Buick, Chevrolet, Chevy, Chrysler, Ford, GMC, Lincoln, & Mercury vehicles with 5x5" (5x127) Bolt Pattern and 1/2"x20 Threaded Studs [SPECIFICATIONS] Pack of 2. 1.0" (25mm) Thickness | 78.3mm Hub Bore | 1/2"x20 Threaded Studs/Nuts [BOLT PATTERN INFORMATION] 5x5" (5x127) Vehicle Bolt Pattern | 5x4.5" (5x114.3) 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.