I will tell you I shortened my rear bars. The S&W kit will go all the way to rear of subframe...probably better, but I already had interference issues w/previous mods. However, DO NOT do this if you plan to run a back seat. W/back seat, the bars need to enter package tray, and run back to rear of car. I planted my rear bars just above diff on flat area, but I have no back seat. So far, so good w/CalTracs