YEEeeeepppp, Y'all done found out where they are.
Mostly these prices are a little negotiable, especially if not through LKQ or Fenix corporate yards.
I believe the 8" X 8" would be very close to dimensions. Shaft is NOT tapered.
I'm dodging rain showers trying to get projects out of the way, but, will try to add much more information maybe late today.
That core charge is just double dipping of money by salvage yards. Ain't nobody gonna rebuild one of these.