If they don't sell you the transformer for some reason at least you have the option of sending the mic to them and they will replace the transformer themselves.
By the way, what's the problem with the transformer?
It's not normal for those ribbon mic transformers to burn (at least I never ever came across with that), problems are normally a broken coil wire or connection, I'm pretty sure it can be fixed, probably an easy fix.
It can also be rewired, and you need I can rewire it for you, where are you located?
Show us some pictures