I thought I was on Screamandfly.com when I saw the request for a 15" mid. LOL. Wish I could help. While not an OMC expert, I always thought the 20-35hp motors fit the same mids which were the 15" or 20". Best of luck in your quest.
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1996 -19' NV Flats 115 Mercury 4-stroke
1983 -20' Wellcraft Center Console 250 XS
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