Hey Tom,
I think ebay or aomci.org's free classified is the best bet. nymarine.ca has repro plastic medallions if there's on on the lark, but they aren't painted and therefore are nearly useless to me. Aomci members have been very good to me on parts--I bet they will be to you as well! So good to me, that I've sent off for my own membership....
Good luck,
JBJ