Help please with wheel fitment on 96 1500

Alright im looking for some 22's for my silverado thats bagged but need to know what will fit and i found these on ebay http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&rd=1&item=7948824013&category=43960&sspagename=WDVW

The guy said they had 5 3/4 back spacing if that not good enough what do i need to look for. Like what the amount of backspacing do i need on a set of 22's ? thanks for yals help i wouldnt know what to do with out this web site ! lol