so here I have a new headliner I am installing on my '53 1/2 ton. Two questions 1) first, which piece should be installed 1st the front or rear? 2) more importantly, I have forgotton which way the center strip goes. Looks like it could work either way, but I'm not sure if the front section slips into the "deepest" groove or does the rear? It apparantly will make a difference in that when properly installed, one section (front or rear) will be "top" (closest) to the cab of the truck, and the other will be "lower"....anyone follow?