For sale is a Good (single) New S&S Cycle 3 5/8" REAR PISTON (No Pin or rings). Part Number reads: 92-1830R. Fits 1936-1984 Big Twins with 4 5/8" Stroke. Check out all of the pictures before you purchase.  VERIFY your needs before you purchase. 10% restock fee may apply if returned. Visit our EBAY Store ALPINE AUTO by adding my eBay Store to your Favorites