go to www.competitionengineering.com then go to instructions part# C 3012 1969 Camaro This sould give you a real good idea how to make them and install them . They are like 2"x3" boxed 3/16 steel . And they go from the end of the front frame to the front of the rear frame . Make sure you make them long enough to go inside both frames about 4" COOL