Well, here I am replying to my own posting.
Fact is, since asking for diff output shafts from a 1988 300ZX Turbo SS w/ Viscous LS, I have learned the following:-
-No other diff output shafts will interchange;
-Nissan's parts network has no sources for these shafts;
-The salvage yard network has no ability to even identify these shafts;
-in 1988 Nissan landed 1000 Turbo SS cars in the US. Plus 75 more in Canada. No doubt there are some of these in scrap yards somewhere - but what odds of finding one??
I am now pursuing the idea of machining the needed shafts from heavy truck axle shafts.
May seem unlikely, but this approach has much more chance of success than seeking out
original parts.
Stay tuned.
Best Regards - Bill Miskoe