***LIMITED ITEM PLS ALLOW 4 BUSINESS DAYS HANDLING TO SHIP*** Replica 3-1/2 inch bore piston set has 8:1 compression ratio and is standard size. Piston set includes Hasting rings 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. FITS HARLEY: 1978-1984 FL, 1978-1984 FX, 1979-1983 FLT, 1982-1983 FXR,