Rob,
The ones from CobraRestorers will fit the Kmp, although a little snug.
I've been told, by someone that has done quite a few original restorations, that they had two screws mounting the covers like in the photo below.
The trick, from the same person, is to take a small amount of material off the front edge on the hinge such that it is easy to slide the cover on and off. Then you mount a piece of wood between the rails, yes that what I was told, and that is what the screws will attach to.
Scott