I have one large & one small window 64. Large rear glass was Panoramic cab option A10. Custom comfort(better seat,armrest, etc) was Z62, Custom appearance(chrome grille/bumpers,etc.) was Z61 for 64, but I think later they were both grouped together in one Custom comfort/appearance option. So a small or large window could be Custom cab. I was told it was $36 option for the large window. Brian


My \'64\'s in the Gallery
Pictures in my Photobucket
1964 C10 Custom Cab 350/700R4
1964 Suburban 350/700R4
1979 Ford F350 4x4 400/c6