Here is something I bought off of Ebay some years ago this one is a little big sometimes but has helped me many times it appears to be a cheap gear puller that some one took the middle piece out and cut one side piece flat and the other tapered a little.
Personally if I was to make one of these I would go a little smaller size like 2" maybe 1 3/4" and as you can see you probably wouldn't be that hard to make.