If you order from LMC, be absolutely sure what you need. They have no tech support to help you, so you are on your own. Also, be prepared to ship them back when they get there and are wrong. Been there, done that. It's not a pleasant experience to ship leaf springs.
Unless they have changed the way they list them, they don't tell you if they are 52" or 56". This was where I got screwed. I ordered what I thought was right, but when I got them, they were 52" springs and mine are 56". I could have used them and moved the rear hanger up 4", but I wanted to keep the 56" springs.
I would talk to the folks at
http://www.espo.com/ if I were you. They actually know what you need.