I just noticed that there are differences between models concerning the shifter types and the footpeg (footbar) position.
Here is my 73 CL K5, Mousetown, with a direct shifter and original footbar. The footpeg is directly inline with the shifter shaft on the engine. The tip of the shifter falls about center to the stator cover. Note those 3 points of reference: tip, shaft, footpeg.
Now here is a 68-69 K0-K1 with a linkage type shifter. The tip of shifter now falls at rear edge of stator cover and the footpeg is now further back from the shaft by a couple inches.
Again, the K5's with a direct shifter have the footpeg even with the shaft. This is a K5 '73 CB350G that has the same front to back positioning, with the tip near center of stator, not at rear edge of stator. This is enough room here, because of the pipes, to remove the shifter for sprocket cover removal.
The '73 CL K5 is a pain to remove the sprocket cover because one must also drop the footbar to be able to then remove the shifter first.
Putting a direct shifter on an older footbar that has the footpeg to the rear of the shaft would mean the tip of the shifter might be a big stretch, unless you have big big feet or ride with swim fins.
So, the K5 s (CL or CB) footbars put the peg forward, in line with the shaft. If one then uses a linkage shifter, with it's tip further back, one will need very tiny feet or toes amputated. This may be more uncommon because most want to ditch the linkage shifters, and keep their toes.