I just picked up a kit for $40 US from www.rpmoutlet.com and had them installed last week. It pretty much did the job i was looking for and was easy to install. I think it's the same as my 2003 Harley truck if you have rear leaf springs on it. Took about 20 min on the hoist. Here is the link:
http://www.rpmoutlet.com/lightmagna.htm

Look under the suspension options on left side of page. DJM lowering shackles.

Hope it helps.