Part Number: 11-0283 Manufacturer: Replica UOM: 1 - SET Summary:Replica 3-5/8" bore piston set standard size with 7.5:1 compression ratio and an outer diameter of 3.6250" with .0025 clearance. Finished bore size is 3.6275. Set includes Hasting 3 piece rings, 2 wrist pins, and 4 circlips. The pistons have a steel expansion control strut cast. Finished bore size is 3.6265" . **Note:Run engine at moderate speeds for at least 500 miles, avoiding excessive running in lower gears, in order to properly break-in new pistons and rings. Fitment: FL 1948-1984 FX 1971-1984 FLT 1979-1983 FXR 1982-1983 Country of Origin: USA