I finally installed my RESTORED Becker Mexico TR that Aaron rebuilt. He replaced about a dozen parts ( I got a baggie full) and it works great - amazing - sounds so much better.
I was originally going to re-install this Mexico TR into the '71 280 but Aaron advised that it was "correct" for my 250 - so I removed the blaupunkt from the 250 and in it went - very nice.
The 280 gets the new-old-stock (correct) Europa that I got from Aaron - it's literally brand new.
A HUGE thanks to Aaron!