That's the problem. The cost of the adapters drive the price up. You can search for earlier bullit rims in 17x8 with 5.92 backspacing and run 1/4" spacers.
But in the rear you will need 1.5" spacers Or run a rear end that is 3" total width wider than stock A-body. And then you will need to relocate the axle spring pads. Sometimes that is an inexpensive way to get a 8 3/4 rear.