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:
Proportioning Valve Mounting Plate
Product Details
Brand: Welder Series
MPN: 070700
Thickness: 3/16"
Hole size: 1/4"
2" x 1-7/8" with 2 holes, 1/4" dia, on 1-1/4" centers.
Designed to mount Stainless Steel Brakes’ proportioning valve.