That was incredibly hard to read. Please keep posts shorter and more concise, it will make assisting you much easier.
I would use the mount you have, it should be fine. Once again don't just assume the mount wasn't replaced, just because you don't have anything saying that it was.
The transmission mount may be sagging, causing the lean to the left. There is a good chance that all of the mounts are somewhat worn if they are indeed the originals.
Buying parts from outside of Australia is at your own risk. It's a risk that has paid off for me, more times than not.
I have not seen the underside of the plate on the top of the specific mount that you have; however, it should have a recess for the locating pin(roll pin) or that pin can be removed.