In my 3 window I used the original seat and the low profile tracks from Speedway. Kept the seat at stock height. They were not hard to attach and make work.
The 32 3W seat tracks (pair) are symmetrical, they are interchangeable from side to side. Hard to take detail pics of black parts. Anyway hope this helps.
The photos below, while for the standard and sport coupes, cabriolet, and Fordor and are shorter, may be helpful as they are in the original cadmium plating and have the same cross sections as those for the deluxe coupe.
It's tired and Im late. From the pictures it looks like the rail pieces (with the half circle cutouts) are the same length at 17" and have the same bolt pattern for 3W, standard coupe, sport coupe and Fordor. The 3W track measures 18.5" long and without a measurement i would guess the standard coupe , sport coupe and Fordor version it is about 14" long. Again that is a guess and not an issue in this thread.
That one lonely bolt in Dave's picture is an example of the carriage bolt used to secure the track to the bottom of the seat frame. It conveniently fits into the the channel in the track.