Also Available on eBaySenco Stapler M1 M2+ M3+ SC1 Rebuild Kit includes O-ring Kit + LB5005 + BB0147O-ring kit + Valve Seal LB5005 + Bumper BB0147 For Make: Senco For Model: M1 M2+ M3+ SC1 Available Qty: 8 Post navigation Part BB0151 + BC0178 + LB3499 LOTS of hard to find Senco Parts