I have a '48 Chev. 3100 and am in the process of installing the Windlace and seal around the perimeter of the door jamb. ( what a thrill) I'm sure this has been discussed somewhere here, but I had a difficult time finding the answers to my questions.
The Windlace and seal, front and back both curve to the inside of the cab at the bottom, then secured. Also meeting up with the Lower Cab Seal and Retainer, plus the rubber floor mat. How do this all get sandwiched together? Like to be able to access the battery and brake reservoir with out having to remove it all again, once is enough, lol.
I've thought about putting a notch in the floor mat to go around the windlace and seal.
The stock configuration of the floor mat is for it to lie on top of the lower windlace retainer. I believe that the upper windlace bottom ends are to cut match the contour of the lower windlace rubber.
I know that you did not ask about this, but I offer these two photos to show the unique trim piece that ties together the upper windlace tail pieces and the headliner cross bow end for both sides. They were only used with the early AD trucks. Just ignore the business cards in the background; the headliner is behind them