ECCPP Wheel Spacers Adapters 2PCS 5lug 1.25" 5x5 to 5x5.5 | 5x127 to 5x139.7 Fit for 1964-1987 Buick Electra LeSabre Riviera,2001-2012 GMC Savana 1500 Safari with 1/2" Studs REQUIRED that you Check your vehicle compatibility in Product Description BEFORE buying 32mm or 1.25 inches Centerbore 78.3mm Vehicle Bolt Pattern 5x127 or 5x5 Wheel Bolt Pattern, 5x139.7 or 5x5.5 StudNut Thread 12"x20 or 12" UNF CNC Machined using high quality aerospace aluminum Designed to move the wheel further out from the hub Gives your car a more aggressive stance allows for better handling characteristics