http://www.classicchambered.com/rims/15-5.jpg

I haven't measured one lately, but the backspace should be 3-3/4" to 3-7/8". 5.5" wide ones I have a recorded backspace of 3-7/8". The 5" ones are hard to find, but I've sold numerous sets of them.

Eric - the wheel guy too.

No Man With A Good Car Needs To Be Justified