Welcome to the forum. I am Whizzer illiterate 'cause I ride a 2 stroke.
I am considering getting a used Ambassador II with a sick motor and
installing a Briggs Vanguard V-twin.(Maybe more like dreaming than considering)
I make brackets out of things I have taking up space in my garage, like those
brackets that are left over from ceiling fan installations.
You can get L shaped brackets from a hardware store and cut/bend them as needed.

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"I don't believe in ghosts - but I'm afraid of them" - Mark Twain