Which mags fit stock A body disc brakes with 5 x 4" bolt pattern

'64 Cuda said
Agreed, big difference. I spoke to a wheel supplier who only seemed interested in talking about backspacing. What I really needed to know was offset.

Yea it can be confusing alright. If you know offset or back spacing you can go here and see what the rim will look like.
http://www.rims-n-tires.com/rt_specs.jsp
And it tells you the offset and back space, in inch's and mm.