Are the seats between the A, B, C and D variations compatible across the board? I have a 81 440 A, but would really love to change to a B or C seat. Looking at photos of the different models, it looks like maybe I can get away with installing a B seat without changing the rear end, whereas I would def need new parts changing to a C seat. Anybody in the know on this subject?
The LTD models have different frames: there is a dip in the cruiser frames (under the seat) that is not present in the kz440B frame.
440A frame (1980 because Partzilla doesn't have a pic for the '81 440A):
Partzilla is a great place to look if you're wondering about parts compatibility.
Also you can keep your existing seat pan, remove the cover, and use a bread knife to trim the seat foam into the shape you want. You may need to have a custom cover made, though, or if you're lucky you can find a generic seat cover that will work.
1979 KZ400 Gifted to a couple of nephews
1967 Yamaha YCS1 Bonanza
1981 Yamaha XT250H
1981 KZ440 LTD project bike
2013 Yamaha FZ6R