The 20-0087 O-ring Service Kit is compatible with both new and old style "standard" (4" OD) fuel surge tanks (FST and FST-R).
-Small O-rings for M5 bolts (x16)
-Large O-rings for older style FST (x2)
-Gaskets for newer style FST (x2)
The 20-0088 O-Ring Service Kit is for the large (6" OD) surge tank canisters.
-Large gaskets for canister lids (x2)