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

Post a picture of it. That is the easiest way to tell.
Here you go.
This 489 SG suffered a case failure as one of the spider gears seized onto the cross shaft thus spinning the shaft in the case causing the holes in the case to wobble out. The other spider is still free on the shaft but will not slide off the shaft because the end of the shaft is screwed up from spinning in the case. If you could get it off the shaft I believe the 10 tooth spider gear is serviceable.
I give you all the internal parts for the $ cost of freight.

Sg1.jpg

Sg2.jpg