Rocket Vintage Style Knockoffs fit on all classic styled 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. Wheels that are 15x6 or narrower should run Flat Angle Spinners.