It's threaded from one direction or the other. Either the bolt enters from behind the plate and threads into the sleeve that the peg is attached to, or, the bolt threads from the peg side into the plate. The way the pegs are chamfered underneath, suggests the bolt might come from outside in. The bronze bushings are there to allow the linkage plate to operate without binding or galling. Probably its a 3 piece unit, with 2 bushing: the plate with a sleeve attached, the bushing pushed onto that sleeve, an outer linkage sleeve, bushing, then the peg.
I'd bet the operate like butter with those bushings. The sets I have are very smooth because of the bushings, but they are also able to be indexed (rotating the linkage clockwise to achieve best alignment). Not as elegant a design as Kott's, but same functional pieces.
Two other obsessions about that picture: the units shown are "upside down". The toe pegs indicate this. The unit on the right is the brake side, and the unit on the left is the shifter side. The pegs are smaller for shifting. The other observation is the long shifter rod doesn't show a thread on one end. I wonder how you would attach the rod end to it?
I'm sure the orientation of these doesn't matter, and that its all for "presentation" not illustrative for installation. But it's not an observation...