They will fit. The coils have the exact same boil diameter and tab location as the coils on all models going back to 1980.
I successfully fit them to my 1983 Pantah 600TL for size and function and then installed them on my 1996 600SS.
They are nearly the same dimensions as the old Motoplat coils as well. The only downside is the spark wire comes out the opposite end, but that just necessitates a slightly longer spark wire. Same dimensions and layout as a Yamaha coil, but has different electrical specs.
Comparison pics:
Diameter comparison:
Mount post comparison:
Kokusan (earlier model):80 mm (all carbed models)
Motoplatt: 80mm (Pantahs and later Bevels)
Exactfit: 80mm
Overall comparison:
Wow, thank you for the great post! I will show Chris!