O-RING for quick conn. HPOP to Head

[jpalma]

I finally found the source of my oil leak that has been getting worse over months now. Does anybody know the part # for just the O ring that goes on the threaded side of the fitting into the head? Or do I have to replace the whole fitting with a new one ? Or could I buy a bulk one from a hydr. store if so what viton(i think is the measurment) strength would I need. Thanks in advance gotta have this finished before thur night because I am going to Canada, Goose hunting Josh