'90 F-250 Suspension

My granddad has a '90 F-250 Standard cab 4X4 with a 6" lift(it was on the truck when he bought it). He doesn't like it, and wants to lower the truck back to stock hight. I'm acctually looking for a similar truck at the moment. We've decided that if I can find one that is still stock, we would trade suspensions and both be happy. My question is, Obviously it must have 4-wheel drive, but do I need to get a standard cab F-250, or can I get an extended cab?

If you end up not finding another truck, I would like to buy or trade your lift for a stock one off mine. I would just need the front springs and rear blocks or springs as it may be.....Mo in CA