...These are the factory Scheel seat-rails used by the Porsche factory as well as the dealer built 914-6 GT race cars. The GT uses four 5mm cheese slotted head bolts http://www.pbase.com/9146gt/image/42358518 , two in the middle and one at each end.

Over the years, I have collected many of these seat-rails in various stages of disrepair and in need of restoration. Below are some of the photos I took showing what had to be done in order to get all the rails to slide smoothly and properly restored. The last step, plating, still pending. Take a look