chris,
I amd only aware of Edelbrock AIS shocks that can be ordered specifically for lowered vehicles. The work good, however I have heard several people complain that they only lasted about a year??
If you are only lowering your truck about 2 inches, then any good quality shock will work. The only thing that the Edelbrock shocks for lowered vehicles do is use a little shorter shock to center the piston in the middle of the shocks stroke. If you use standard shocks, you may hit a bump and damage the shock by collapsing it till it bottoms out. If you leave your rubber bump stops in place, you can avoid the damage to the shocks but you may get a pretty hard jolt when you hit a pothole.
...Rich