SMV lower control arms?

[rs74]

I have an 03 1500 Z71 that has a 6.5-7.5 lift kit on it. It also has lower control arms that are stamped SMV. I can not find anything about these from doing a search. Was hoping someone here could tell me about them. I am wanting to take the lift off and possibly go back stock or put a 2.5" key set and level the truck. Can I use the control arms on it if I go either way or are they designed for something specific with the lift that is on it now. This is the kit that was put on but the control arms are not a part of it. http://www.superlift.com/lift-kits/6...-lift-kits.asp

I am trying to figure out all what was taken off and put on when doing this lift so I know what I need to do or get to take it back down. Is it just a factory control arm? Looks like a GM number which looks like is a good number.
Any help would be appreciated.