True, but.. The Pro chassis 2011-12 use all the same fasteners in metric all 10mm. The 2013 "Pro" same as the 11-12 with the exception of the lower only shock bolt which is an 8mm. The Assault is all the same as the 11-12 pro on all of them, meaning they did not use the 8mm lower shock bolt. Not exactly sure on the stock arms, but ours did have to make a change on the Pro chassis starting again in 2011 on the upper arm due to shock spring clearance. Also keep in mind if your swapping uppers its not just the mounting bolt on the upper arm to spindle bolt you would have to change to make work from one to another, because the rod end (heim) also changed from 1/2'' to 12X1.5mm on the pro. Ok, wow that im thoughly confused....Clear as mud! Thanks.
Dan