Customadeonly 5x115 70.3 Cb 12x1.5 Studs 20mm Hub Centric Wheel Spacers for Buick Century, Electra, La Crosse, Le Sabre, Lucerne, Park Avenue, Passage, Reatta, Regal, Rendevous, Riviera, Terraza Please be sure to confirm the fitment & compatibitliy prior to purchase - If you are not sure if this is applicable to your vehicle -please feel free to ask us! QTY: 2 Wheel Spacers .Designed to improve the handling & appearance of your vehicle Made with high grade T-6 Aluminum - CNC machined with precised fit Carbon steel wheel studs- machine pressed (Extremely durable). Factory studs may need to be shortened. Fit Vehicles With Bolt Pattern: 5x115 , Center Bore: 70.3mm & Thread Pitch: 12mm x1.5 . -All lug nuts should be properly tighten with factory torque spec. Average 80-90lb Your Factory wheel studs may extend past the surface of the wheel spacers. In this case, you will need to: 1) Shorten the factory studs 2) The wheels need to have the open slots (cavities) between mounting holes. 3) Purchase a set of shorter studs and replace them with the factory studs.