Depending on which Toy 8" you get, the R&P size will vary. I believe there are three types. The Basic Toy 8's, the V6/Turbo and the Tacoma. Some parts aren't interchangeable. I believe shafts are though. So you cna swap from 6 on 5.5" to 5 on 4.5" if you wanted to. Lockers will be dependent on the axle also.