Hi Bill. When a custom dropped pan is installed, the dimensions of the pan are barely enough for the seat without adjusters. Seat-rails raise the seat(s) up by a few inches, removing some of the headroom gained from dropping the pan. So rails aren't included. If the stamped-in crossmember in the pan just in front of the seat is cut to use rails, the monococque may be weakened with very little fore/aft seat adjustment gained. Easier for you to add seat-BACK adjustment so the rake can be adjusted. This is simply done by slotting the seat-back tabs and using hand knobs on the metric allen bolts. Only works with stock ('71-72) removeable-back seats, though. I'm 6'2" & with stock pans & raked seats, I clear our roof wearing a helmet.