I agree with Ron, check with Goehring first, he has a lot to choose from and might have it. Although last time I spoke with him at Friendship he no longer was able to use the foundry that was turning out those buttery soft smooth casting we all love so much. The new foundry was a little rough, I know he was disappointed with them. Another option, go through the TOW catalog with the full size pictures, there might be something in there that you can use as is or if close, could modify to work with some judicious hammering and filing. Good luck
Dale