Forwarding this fax from George of Riehl: Installing a power seat into a 300C without original p/s, one must make major modifications to the floor and frame. The power seat "bolts" directly to "outriggers" welded directly to the frame thru the floor. Non p/s systems do not have these "outriggers". Plus the p/s floor has a recess that incorporates an "insert" (long tapered pan) into the floor. Plus the p/s brackets are wider than a non p/s system. A non p/s seat bolts directly to the floor with large metal reinforcements under the floor. This is a major job, but with the right equipment and parts it can be done. '57 seats have "plastic" skirts on both sides, no chrome. George Riehl