leaking differential pressure regulator

[no1of consequence]

at least i think its the DPR - little black box [about 2"x3"x1", has a 2wire 
connector] that bolts to the front of the metering head. it seals against 
the head with 2 o-rings. it had been weeping + i got new orings from the 
dealer [they are green] but now its leaking worse. could someone send me the 
part numbers of the orings so i can verify i got the right ones? i would be 
eternally grateful....

any btdt on fixing this?

thanks
jim

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