Need Trans Mount Help

This is (I believe) a 45RLE. It came out of a 2000 Dakota RT, along with it's 5.9 liter Magnum. It was a 4 wheel drive, I had the local trans shop obtain, rebuild, and install a 2 wheel drive overdrive unit. They did me a "favor" and got me an older one out of a van, so it would have a speedometer drive. I didn't get the opportunity to see how it was mounted originally, nor do I know exactly what it came out of. Can anybody tell me what holes I should be using to mount it? Does it matter? I believe both the pair of holes by the sensor and the single one further back are tapped. Anybody know a part number for a relatively small rubber mount? The ones that came on the vans, as near as I can tell from Rock Auto, are big, ugly, and expensive. This is all going in my 36 Plymouth sedan.

Trans tailshaft.jpg