Isn't there a sticker somewhere in the truck with all the codes on it? I know GM does that trick....

 

If there is I dont know where

 

There's usually a small sticker in the glovebox but it generally only has engine, trans, rear ratio and color codes.

 

My 05 was sitting lower in the front and I replaced everything and it really didn’t make any difference. I replaced the shocks with some gas charged shocks and it raised it up a lot in the front.
Springs should be the same unless you get some really good progressive type of springs. I got just the stock type at rockauto.com if that helps any

 

Trucks sit higher in the back right outta the factory. That's normal. When you put a load in the back, it tends to squat. How much depends on how much of a load.

 

Something seems off here. What shocks did you get for the rear? Maybe they were for lifted vehicles. Leaf springs will really determine rear ride height.
Front springs should not be that difficult. The Moog 81186, ACDelco 45H0447, or Husky SC20672 should all fit your truck. Do you have special mods?