The company that makes the Caltracs is
Calvert Racing, there is a phone number on the home page of their site. Ask to speak with Travis, he has been very helpful to me. He will email you a sheet that asks for some measurements. These are not an off-the-shelf item as each truck is different, stock height, lifted, full spring lift, block lift, B codes with blocks, you get the idea! But they did have all my parts in stock and at my door in two days.
I just read another post on another site that I post on that he has them on his "truck", likes them alot also but added that his ride is stiffer. I haven't driven mine enough to verify that it rides rougher yet but I will test it this weekend.
