Rocket Vintage Style Knockoffs fit on all on all NEW Rocket Racing Wheels. Knockoffs with threaded adapters are sold in pairs, 2 Right Hand Thread and can be mix/matched according to offset. For Hot Rod/Muscle Car applications that run big & little wheel combos, you can order a pair of flat & a pair of deep angle spinners. Modern Muscle Booster high offset wheels and wheels that are 15x6 or narrower should run Flat Angle Spinners. Available in polished or chromed finishes.