Listing on ebay for SPS Stapler Driver Blade and Piston Assembly #EA0107 @ $30.00 each delivered. Toolpartsdirect $76.75 + Shipping. Same seller SPS Driver Blade + Piston #AE0103 @ $20.00 delivered, toolpartsdirect $48.16 + Shipping
NOTE: The above assembly does not come with the driver O-ring, I have the complete o-ring kit for the SPS below. The SPS shares the same O-rings as the SKS and SFN1.

BF0073 for older Senco SKS SFN1
BF0073 for older Senco SKS SFN1
1 new aftermarket seal BF0073
For older Senco SKS SFN1
Available Qty: 12