oldblue,
HERE is the link where I ordered my floorboard. When buying mine I just did comparison shopping against buying stock replacement or aftermarket. Only reason I bought this one was because I wanted the transmission hump so I could mount the engine a little further back. Is a bit pricey but it really built my confidence up to start cutting on the rest of the truck.
Bracing was a bit tricky cuz I had to give myself room to work. I tacked a diagnal piece at the bottom of the cab on drivers side and went to the top of the passenger door. Because I was cutting out kick panels too i did some bracing across cab from door pillar to door pillar leaving it high enough where I could work. Also the kit provided the pieces to tack the rocker panels to the frame so that kept the rocker panels from pinching in or out once I cut the floor loose.
