Kawasaki Triples Club

Does anybody know where these distinctive looking concave head m10 x 45 bolts are from? I got them years ago thinking they were for my H2 but now I'm not so sure

The odd length & short amount of thread indicate that they are brake caliper
bolts from a modern bike.

That's a shame. Useless for me then. Must have keyed in a wrong part number when I bought them.