My Scrap Book ..illustrates the different cross-member combinations that work together in the 1960-1970 Chevy Trucks for upgrading to Disc Brakes. During these years of 1960-70 there is at least four different OEM combination cross members that the factory put under these trucks. If you're tied of the old Drum brakes up front, this is the book for you. Learn here the upgrade combinations. Avoid miss matching parts. No more guessing......know what...