Rich, Bailey's has them. Even for .325. I had thought they discontinued them, since all the saw dealers around here no longer carried them. Was glad to see them, especially in .325.
Tilton Equipment Co. in Rye NJ has them. That is where I get mine. They are a Carlton Distributor. They may sell you one direct if they show no dealer near you.
Crofter is correct, The plate may not work for you if you cannot get Carlton chain. It works on some other chains, but certianly not all.
I have had the same one for over six years now. It goes on the dresser every night with my saw wrench. When I get up in the morning it's one of the first things to go in my pocket. Handy little tool..............Wade
There is quite a few separate plates for different models of Carlton Chain. I'll scan the card and see what comes up. This one is for standard 3/8 chisel