SX Series Single Piston1) Single SX series replacement piston with wrist pin and pin locs. Put the full part # of the single piston you require in the note section of the check out page. For Example: 8100 4030 CAUTION: Like a pair of shoes, best engine building practices dictate that pistons should be replaced in matched sets. That being said, single pistons are available. However, the following points must be understood and considered. DSS Racing pistons are normally