I notice you are from upstate New york.<br />Try H Chalk & Son Fishers Landing NY.<br />My family has been doing business with them for <br />50 years. Run for 50 years by the same family.<br /> Phone 315-686-4125 or 315-686-5622.I would put money on them having your part.Try their web site. Just use google put in H Chalk and Son. Good luck.
Steelespike's right - Chalk's probably has it. Their website is www.hchalk.com . You'll want to talk to Cliff or Butch. Your 18 is certainly worth putting a little money into - one of the best motors OMC ever built!<br />- Scott