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Onan carburetor main jet seal / kit?

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Doing a little PM on the 720, cleaned up the fuel system etc. The carb seems fairly clean, was running a bit rich. Anyway I was hoping to find a replacement seal for the main jet, mine seems pretty hardened.... I see the parts listed below, and the main jet assembly, but does anyone know if that seal is a generic one available anywhere? All the pictures of the carb kit don't seem to show the main jet needle or seal that I could find.

Thanks, RIck

Onan 19.5 Zenith carburetor for CCKB-MS 2733 / J

Some service parts for Series 1408, part # 13262 still available but not included in service kit:

C54-39-2-27 idle jet tube assembly

C63-254 vent tube

C66-133 discharge jet

C85-129 float

C3-132 fuel bowl

C29-1593 throttle shaft assembly

C21-219 throttle plate

C108-294 choke shaft and lever assembly

C102-139 choke plate

C71-105-34 jet adjustment assembly

Overhaul Kit # K2165

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