Super Jet Pro Design Cool Head O-rings??

Location
LI, NY
Hey i believe to have a bad oring and need to know where to get new ones from. Since the company no longer exists, i want to know which o rings to buy. I have heard Riva head o-rings fit, but wanted to make sure as i cant find much information on this thing.

Motor:
61x with 760 top end, girdled cool head 180 psi (35mm domes?) Factory b-pipe (stinger and pisser fed from head pipe)

Symptoms:
Pisser spitting instead of a constant stream (in water and on hose), water on one plug. Compression down 10psi
 
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