I believe you want about 4-1/2" backspacing. Less will work, but more would create rubbing and make for clearance problems with the brakes.
This reference is handy:
http://adaptitusa.com/referencebook.htm
Bolt Pattern: 6X139.7 (aka 6-5.5)
Lug Size: 12mmX1.5
Center Bore: 106.0
Beware wheels for Chevys, as they have a smaller center bore.
HTH,
Jon