I had the same issue with a '83 760. Couldn't find the passenger side mount anywhere.. Rock Auto had one but it was not really right. It was very undersized, and did not hold the engine up where it should have been. I never found a good source, but did end up finding the right mount on Ebay (new). My 'Plan B' was going to be to use the transmission mount (like you mentioned). The only difference between them is the pins to keep it from rotating.
Spenser
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