The bracket you want was included in the box with the new AC oil filter package.
https://oldchevytrucks.com/blog/2010/02/1948-1953-horn-bracket-location-changes/
Just a thought:
About 1957, cars had a lower profile hood requiring the oil canister to be moved to the other side of the carburetor (towards the firewall).
This would allow the straight bracket to be used for your horn.
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Car RPO 237.jpg (82.83 KB, 131 downloads)

Last edited by buoymaker; 06/01/2022 4:22 PM.
"Adding CFM to a truck will only help at engine speeds you don't want to use."
"I found there was nothing to gain beyond 400 CFM."