Found under the following brands:
Rebuild Kit includes Rings, Gaskets, Valves and canister style Air Filter Elements. NOTES: Order L54E if you have hollow, wing nut style filters. Head gasket is for 5 hole style. Order part # 104-1008 if the head gasket with the 6 hole style is needed. (for pumps without unloaders). Use 610-1297 if your pump has a U at the end of the pump model. ie GU, MGU etc.
The G, GC, D, DC, L and LC pumps all use this rebuild kit and the 610-1298 replaces all older rebuild kit part numbers.