I have kits for these below.

I also have kits for these on eBay

SN1 Seal and O-ring rebuild kits

SN1 O-ring Kit + LB5004
SN1 O-ring Kit + LB5004
SN1 O-ring Kit
Seal LB5004
Price includes shipping
Available Qty: 6
LB5004
LB5004
Aftermarket Seal Part LB5004
Price includes shipping
Available Qty: 11