Need help identifying gear
 

I recently purchased a couple transmission gears. They were both supposed to be A7100 low/reverse sliding gears. I am attach a picture of the two gears side by side. The gear on the right is a actual A7100 and has the number on it. The gear on the left was supposed to be the same gear, but is different in a couple of ways. First, it has a larger spline hole in it as you can see. Second, the part for the shifting fork is also larger. It doesn't have any marking on it at all. I think it might be a gear for an AA four speed transmission, but that is only a guess because of the larger items on it. I would appreciate it if someone could identify it. I can take some measurements if that would help someone identify it. Thanks for any help.
Rusty Nelson

http://i201.photobucket.com/albums/a...ps9ee30c67.jpg