Wheel help

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Hey guys i'm looking for help on some wheels for my 72 blazer and yes a used the search function didn't help on what i needed.Well heres my question im looking at these wheels for my blazer http://www.jegs.com/webapp/wcs/store...0002_379967_-1 and it doesn't give any listing of backspacing or center hole and i was wondering if these rims would fit on my blazer it has 4 inches of lift and i plan 33's on the rims heres my blazer

Thanks in advance