I need apart for a members 8 3/4” SG I’m building.

IIRC, that is the same as the spider gears in a Dana 44 power lok. That might open up some possibilities. I might have one but will not have a chance to look until Sunday.
You are absolutely right. The spider gears and the cross shafts are the same as a 8 3/4” Dana clutch SG. With the exception of the thrust button holes. You have to drill the Dana 44 ones. I’m not in a big hurry if you get a chance to look that would be great.