replaced my shaft, cutlass bearing, flex coupling and stuffing box in 2008
I have an '86 E38...
I had a new shaft made for the boat at Bossler and Sweezey in Bellport, Long Island (
http://www.bosslerandsweezey.com). I imagine you can find a vendor closer to you, however, this shop came highly recommended and I felt they treated me well. I paid a little over $750 for the shaft, new flex coupling (Federal Motors?), cutlass bearing and the stuffing box components.
I have no idea as to OEM specs - I had to cut my shaft to get it out of the boat - despite my best effort I could not separate the coupling from the shaft - I brought the pieces to the shop and they replicated it. I'm not an expert but I believe the shaft material (1"), taper and thread is pretty standard - I think there is even some "wiggle room" on the overall length so long as the prop does not interfere with your strut/hull or rudder. My guess is they probably don't even need the old shaft, decent measurements will suffice - suggest you talk to them to confirm...
Some of my experience for what it is worth:
As I recall getting the prop off was not "easy" - I had to use a brake puller and a torch to free the prop from the shaft - I remember a distinctive "pop" when it freed and after that no problem. I have a Martec folding prop - mailed it back to them and they refurbished, balanced and sent it back real quick - looked like new. That was worth it...
Getting the new cutlass bearing in was also a challenge - I ended up having to fabricate a home made prop puller similar to this (
http://www.alberg37.org/Newsletters/Vol13-no2-Spring-2003/vol-13-no2-Spring-2003.htm) and pressing the new one in. probably not needed but I drilled two holes in the strut, tapped them, and installed set screws (there were none existing). Had a hard time getting the new shaft in past the rudder - the wear on the old cutlass bearing enabled the old shaft to come out easy - with the new bearing installed it was tough - if you can put the shaft in first and then press in the bearing that is the way to go. The bearing was a little long and I actually cut in half and pressed from both directions - perhaps not totally kosher but in my research others have done the same and the bearing I removed was also in two pieces. It has worked fine no issues - -
Good Luck !!