The final mods to the horn bracket took a few trials (and errors). But ultimately this is how it went. You need to remove a portion (shown), re-bend the tab that holds the bracket straight and re-bend the end to turn the horn mounting hole 90 degrees. I was tempted to just cut the support tab off but thought better of it because it really does do a job so I kept it.

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Like so:

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Final shape:

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