Hood and rear fender from a 60 or 70 series will work on your 50 series and are a metal replacement. The Floorpan is metal either way. The under bonnet or what wraps around the engine unfortunately is plastic on all 50 60 and 70 series. They are not terribly expensive new though. I have hood, fenders and Floorplan from a 60/70 series available in my salvage yard in northeast Alabama. If your interested send me a message.