However, the frames across the years did change, for example the 18 frame is quite a bit narrower than the 21. Never seen a naked 16 so dunno about that one, but the 28 is remarkably similar to the 21 except for the single sided arm of course.
_________________
MC21SP Plaything
BMW F800GS Bumblebee
Triumph 9551 Daytona Big boys toy
FJ1100 Sporting relic
GTS1000 oddball
