Rallye wheels

[will2k2]

I went to the junkyard today and picked up a set of 4 Chevy truck Rallye wheels...the common ones seen everywhere.

Ok, well...after starting to clean them up, I noticed that 3 were the same and 1 was either a lot wider or the backspacing was different. It looked like it was at least one or 2 inches wider. That isnt a problem..in fact I plan to get another to match it for the rear. My question is..what are these wider Rallye's found on normally? It's a 5-lug and has the cap that bolt on from the front.

Thanks!