This is an issue with commercial door hardware as well, screws and bolts sometimes have head sizes that are used nowhere else that I know of. Hinge screws have oversized heads that you can't find anywhere else.
Locking gas caps are the bane of motorcycling. The Germans are the worst, though, on 2 of my BMWs, there's also no way to leave panniers unlocked, as with gas cap, you can't remove the key when it's unlocked.
From what I remember from long ago posts, it requires a different ( bezel, escutcheon?), the trim ring around the front, that's deeper, as it protrudes more. A Harley item, maybe?