1993 5.7 AC brace

[Nitis]

Back about 200k mikes ago dad put a low mileage used engine in to replace the one grandpa overheated

I assume in swapping things over this brace that supports the ac compressor got misplaced. The ac functions fine but it makes a god awful noise when it kicks on. I know this brace cures that noise because we had the same thing happen on another truck.

Can someone identify the part maybe provide a part number so I can find one without spending half a day at the wrecking yard

Thx