When we ran a full service chassis fab/turn-key hot rod shop a number of years ago, it was always useful to have threaded things around to weld into the frame for some kind of mount, etc.
Here’s a list of all our threaded things for your reference:
Formed Brake Booster Bracket
Product Details
Brand: Welder Series
Thickness: 3/16"
Plate, booster/master cylinder mount, formed. The booster centerline is 4-1/4″ off of the boxing plate as shipped, but the bracket can be trimmed to move the booster closer. The bracket will mount Ford or GM manual master cylinders and either 7″ (single or dual) or 8″ dual boosters. Booster mounting holes are 3-3/8″ x 3-3/8″. Designed for our WS24806 kit.