Mike Look on the back of the lug right where the locking lug engages. If there are no markings there than you may have to measure the distance between fireing pins to come up with the frame size.

Well, I need to apologize to all of you. I'm sorry... you all jumped right on my responses to the initial responses and I didn't find them in a timely manner.

I'm hoping to catch the owner on his lunch time today. I'll be back as soon as I can.

Mike