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:
Front Axle Bracket Kit, for hairpins
Product Details
Brand: Welder Series
MPN: 28900
Thickness: 3/8"
Laser-cut steel, 3/8" thick main upright plate has 3/8" diameter holes on 4-3/4" centers. Available welded or ready-to-weld.
Hairpin Axle Bracket (Batwings). For hairpin front suspensions. The 3/16″ C-plates are formed so the main plates are vertical, even though the axle boss is on an angle. Designed for 2″ or 2-1/4″ axle boss.