thanks guys, actually yesterday, we found an acceptable marine plug at O'Reilly's while picking up new filters. And a brief endorsement-They either had or got everything i needed to change filters, including the extra large air filter canister, quoted at $220, but priced at $120 price adj to NAPA prices.
No, i don't own stock in O'Reilly's, just they were a lot friendlier and very knowledgeable here in Thomson, GA.