I recommend cutting out your own. Go for the best: cordovan leather. Many sources of leather, Tandy, etc. Just put on a board, trace from an old tab you like, and cut with an exacto knife or some such. By the time you trim any simple one-piece tab you buy to fit, you'll probably have about as much time invested in it as if you make it yourself anyway, and you probably won't be getting cordovan. If you wanted extra bells and whistles, I’d suggest buying, but for a simple one piece three or two under tab, I see no advantage in buying one already made.