I also had measured the pins in my AJ with a caliper before contacting Bob and he said the same thing. I knew they were bigger than my 1A Taylor pins so I went with my gut and ordered the 2A's from Bob anyway. Like I said above, they were a perfect fit. Here is a shot to give you an idea. Also, bone pins can be sanded ever so slightly to make them fit if they are a tad to big, but I didn't need to sand at all.