ECCPP Wheel Spacers 4PCS (1.5") 38mm 5x4.75 to 5x4.75 Hubcentric Hub Bore Size 70.5mm Fits Cadillac XLR GMC Sonoma Chevrolet Pontiac Firebird NOTEFor The WHEEL SPACERS 5x4.75 to 5x4.75,REQUIRED that you Check your vehicle compatibility in Product Description BEFORE buying PARAMETERThe 5x4.75 WHEEL SPACERS with Brand new wheel spacers.Total Thickness 1.5" Hub Bore Size 70.5mm Vehicle Bolt Pattern 5x4.75 Wheel Bolt Pattern 5x4.75 Thread Pitch 12x1.5 FITMENTThe WHEEL SPACERS hub centric fit for 2004-2009 Cadillac XLR,1991-2004 GMC Sonoma 2WD REAR HUB ONLY - WORKS WITH ALL 4WD,1989-2013 Chevrolet Corvette,1982-2002 Pontiac Firebird and Chevrolet Camaro Need to Double Check front Hub width for proper fitment,1982-1989 Chevrolet Caprice Additional Lugs ARE REQUIRED FOR INSTALLATION ,1982-2004 Chevrolet S10 2WD REAR HUB ONLY - WORKS WITH ALL,1982-1990 GMC S15,1964-1973 Pontiac GTO Additional Lugs ARE REQUIRED FOR INSTALLATION ADVANTAGEThe hub centric WHEEL SPACERS 1.5 inch Designed to move the wheels further out from the hub,giving your vehicle a more aggressive stance and allows for better handling characteristics.They also increase tire clearance,fix brake caliper clearance issues,allow installation of lift/lowering kits and wider, larger, or high traction tires. PLEASE ATTENTIONRequired that you Recheck your vehicle compatibility in Product Description BEFORE buying these hub centric wheel adapter,if you have no ideas,please mail us for help. Before installing wheel spacer adapters, please make sure that you have bought the compatible wheel spacer adapters for your vehicle. You can easily check by placing one wheel spacer adapter onto the rim, screw in the nuts manually, if you can do that without feeling any restriction, then you have got the appropriate wheel spacer adapter for your vehicle. If your OEM studs are longer than the spacer&#039;s thickness, you need to shorten the lug studs by grinding them down or replacing with shorter ones.