Here is black anodized Aluminum plate or bracket. There are two 8-32 thread holes on either end, one 10-32 thru hole on top and a bunch of 4-40 thread thru holes. This is used.
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Brass Bar Stock 1″x 2 7/8″ x 7 1/4″ Free Cutting New Material
All are Cut sizes are either exact or slightly oversize !