I purchased the plane plastics door panels for my 150H and installation consisted of a little trimming around the door handle and edges. Used a dremel tool. I did find that the door strap pull handles would not fit with the new panels. The new panels have a longer humnp where the ashtrays are and block one of the holes needed for the pull handles. You can fix this by moving the two holes aft about 1/2".
The arm rests are hard! I use a piece of velcro on the arm rests and a piece of old sheepskin also with velcro to ease the elbows on longer flights.
