recent discussion about these washers, thicker than standard with flat spot. Necessary to use or you'll break the clamp.
The flat spot is to allow the fork tube to pass by:
These are not available from Honda anymore I think. AS an alternative, the cylinder head nut washer is slightly thicker.
.093 vs .09. You can thin one by rubbing it (hard) against a file or emory paper:
and get it down:
Then grind the flat in with your favorite grinder.
The OD is larger than the original so it will stick out some. If it bothers you, you'll have to trim it down with a Dremel, but at least your bridge won't crack.