So I’d really rather not at the moment, and I suspect that it wouldn’t be worth your while for the cost of postage.
I’d recommend trying to find someone local (or at least in the same country) who can 3D print you a pair (CAD file here). They’re only ~9g and on even a basic printer should take around an hour (which is pretty short when you’re talking about 3D printing).
Ho ho ho.
I knew there would be a gotcha.
I own well over a dozen unicycles with this kind of fixing and still I forgot they existed as the original bumper I measured is just a bumper, and the two unicycles I have in easy reach are both new style KH bases.
The original version does have enough space for nuts and a socket (and even a ring spanner), but does not fit on the new KH base bumpers (due to some reinforcement ridges getting in the way).
I have an idea of how to ensure it fits on both bases, with both fixing types, but it’s going to require another redesign
I’ve got a roll of eSun’s Super Tough PLA (in black) on order now so maybe when that arrives I’ll try again.
For reference, the current ones are printed in eSun PLA+ at 100% infill and 0.16mm layers which seems just fine, but they’ll be even stronger with this new stuff, and be black so blend in a bit better!