NEW MEMBER - need help, lost gas cap

[JGBlair3]

Hey guys,
New to the site here but need to reach out to some fellow owners. I have an 83 V20 Fisherman CC and was getting her in the water last week and of course I left the cap on the gunwale after the fill up and its gone. I've tried replacement caps from west marine (1.5") and none fit. Does this really require a whole new stainless unit and install or does anyone have any ideas for a replacement cap. PM me if you have a scrap you could part with or reply. NEED HELP! Wanna get on the striper run soon!!!
- JGBLAIR3