Jeff,
Make sure that you really know how to do it... The Beaver tail has no stretch in it at all. Also you have to glue it on, I ruined one before I talked to Big Jim. I have been working with leather for many years and I thought I knew what I was doing, lol... Big Jim has Beaver tails for sale all of the time. Once again note, if you have very large hands like I do let him know, the tails are not very big. I have Beaver tail grips on all off my longbows and I love them.
Good Luck,
Ben