Offroad design has zinc plated u bolts for a reasonable price. Single or kits, selectable in diameter and lenght.
https://www.offroaddesign.com/catalog/product/view/id/2388/s/individual-round-u-bolts/
https://www.offroaddesign.com/suspension/u-bolts-plates.html
There are also non quick take up master cylinders with the plastic reservoir. If you don't want to crawl into the rabbit hole of master cylinder data to find a matching one replace what was on the truck.
Cut off and glue on should work. Use good 2k epoxy glue, degrease and prep all parts good. A small reeinforcement plate would be good if it's possible to fit it somewhere.