Brewbud
Brewmeister Meisterbrew
I could be wrong, but I think they are pretty much the same shock with the 4600 for stock height trucks and the 5100 for lifted trucks. It has been a few years since a last talked to them.I know they make them for the larger trucks i have a set on my 05 2500 the 4600s are just much better for the 3/4-1 tons in my experience