boatingbill...no, I'm sorry, I picked up 3 from a club vendor and they didn't come with a number. If you run out of options, I'll let 1 go for $10 postage paid. It worked on my car when I had an exhaust leak the traditional gaskets wouldn't stop...can't speak for all cars & situations (I have a 54 Kaiser). Maybe there's others on the chat who have used them?
Mike