I have one left, listed on ebay
https://www.ebay.com/itm/165620200935
SN325 Driver Repair kit C. YK0157 Driver blade / hammer used in Senco Framing Nailer Model SN325 and SN2-Plus SNII Plus. Includes
- YK0157 Driver Kit
- LB3499 Washer Valve Seal
- BC0178 Top Piston Bumper
- New Driver Piston O-ring
- Instructions
Shipping is free in the US