Attached is a picture of the rudder pedals on my KF4 project. I meant to take a picture of my KF3 rudder pedals but forgot about it. Anyway, take a close look.
The pilot's side pedals on the KF4 the "E" points to the right and the brake cylinder is on the left.
The passenger's side pedal on the KF4 the "E" points to the left and the brake cylinder is on the right.
So... Take a KF4 passenger "E" pedal pair, make the center tube longer for the wider KF3 pedal (OR, cut the KF3 pedal narrower) and viola, a set of "E" pedals for the pilot side on a KF3.
Cheers,
Mark Napier