Idler Wrench?

Can anybody tell me if this is an idler wrench for a cat? It is a 2-3/4" wrench with 4A45 stamped on it. It was in the shop with some other cat tools but I can't find that part number in our parts books for the 22, 30 or D-4 we have.

We also have a cat combine and pull grader, could it be for one of them?

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That's the idler wrench for the D4 2T 3T and 5T models.

Thanks, that's what I thought it was for. My D-4 parts book listed it as a 3B3874 so that's why I wasn't sure if it was the same wrench.

my 7U takes a 2 5/8 idler wrench

Another mystery tool. Was there any cat that used a 2" socket with about a 6" extension and a 24" breaker bar in square stock? The socket is marked D-1. this was also in with the cat tools. I can post a picture if it will help.