I have just been given an old EV 664 dyn...

I have just been given an old EV 664 dynamic mic. the cartrige inside has gone bad, I think it has been in a shed for many many years and has gotten wet some where along time. I want to either replace parts with the same thing as there or maybe up date the electronics inside to something more modern but still have that vinage look, but I cant seem to find where to get the parts? any ideas?????

Bobby