If it looks like the old skeleton keys, but flat metal, I had them for our old CHB trawler. I thought the same thing you did until I just found them in the local old-timey hardware store in downtown New Bern. They are a simple blank and the blank worked with no cutting. They aren't hard to find, but you do have to look for them a little. They were only about $3 each. Send or post a picture of yours. I am driving through New Bern tomorrow or Sunday (oops... they are closed Sundays... darn) and can grab a few for you with no problem at all. Or maybe in a week or two if I can't get there tomorrow. We are in New Bern often.