Here is a picture of a re worked fin on top of the standard reproduction fishtail. The holes are in the wrong spot, and the overall length is too long, so you have to chop it down, re drill the welds and re shape the top of the fin. It is a bit of work, but is still something to work with.
My friend Lock and Leo stopped by from Connecticut. We rode old bikes in for lunch. Here is lock in his storm trooper helmet.