Looking for E34 longshaft (GM-Auto gearboX)

[Bp88]

Hi all sifu, My longshaft coupling no longer in good condition. According to some fellow we can't change the coupling itself and advisable to look for whole longshaft. Engine: M5025BGearboX: Auto (GM)My questions are:1. Do you guys know any place that sucessfully change E34 long shaft coupling (function properly and not vibrate at high speed)2. If I really have to change the whole long shaft, where can I look for the long shaft?Thanks in advance!!!!