ZF well....Mine got done by ZF Service close to Stuttgart in 2015/16. They have an "old" fellow who does know the /2 from apprentis times design and build.
They did all 5 synch, replaced differential parts and replaced the shifter mechanism as was bent. Parts came from RBT (3000USD)
here the adress info: Manfred Huber is the guru..(he is the tech lead of the place)
ZF Services Stuttgart
Robert-Bosch-Str.6 73660 Urbach
Telefon/Phone +49 7181 9800-21, Telefax/Fax +49 7181 9800-50