I have a pair of Bilstein 5100s for sale for the rear of a 73-87 truck. They are listed for a 4" lift but I found them to be too short for my application. They'd probably fit a 2.5-3" lift perfectly or a saggy 4". I put them up on eBay because I'm tired of looking at them. Bid quick and get a good deal 
http://www.ebay.com/itm/181487109072?item=181487109072
http://www.ebay.com/itm/181487109072?item=181487109072
