Thought maybe others might be interested. Just ordered a set seeing as I did the Polaris HD front springs previously and figured I needed to do something for the rears seeing as the quad squats a bit too much on take off for me. Best price I could find including shipping. The same place has them listed on Ebay but want around $105 shipped. $10 is $10. I was ordering either way and just happened to find them cheaper.
POLARIS ATV HD EPI REAR SPRINGS - 400 SPORTSMAN 05 BEFORE by Allsport Performance Inc.