I'm in the process of doing my 46 and I'm replacing all the windows. First thing I did was purchase the patterns from Carters, that way they'll be no mistakes (hopefully).Any well known automotive glass cutter should be able to cut the proper size and mount them in the frames. I have the frames all taken apart, cleaned and painted and ready to go. I will let him do the mounting because if he breaks the glass it's his problem not mine. The rear one I'll have to mount myself. The patterns cost about 35 bucks and I think is a good investment. Fortunately the glass for the Art Decos is all flat so it shouldn't be too expensive as they don't have to be pre made in a factory. Good luck. Bob T