I used their crossmember cap and torque boxes and had them make me some 14 gauge inner rockers. they are in my 69 charger 6 years ago there was not anything factory replacement .but I wanted a solid frame with out puting in a cage its a street car 700 horse stroker motor .for the track I would take my altered , because real race cars dont have doors (LoL) , had dave make me some custom peaces worked out great. my play cars as in 2 dont go in the trailer.