Part Number: 11-0238 UOM: 1 - KIT Summary:Piston set with 3-5/8" bore, 7.5:1 compression ratio and is oversize .010. Set includes Hastings 3 piece ring set, 2 wrist pins and 4 circlips. pistons have a steel expansion control strut cast. **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: Imported