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:
Sway bar mount for axle bracket
Product Details
Brand: Welder Series
MPN: 227033
Thickness: 10 ga
Hole size: 3 x 5/8"
Use this bracket to mount your sway bar outer tube (1-3/8" OD) just below your four link axle bracket. 3 holes, 5/8" diameter, on 1" centers.
Bottom 5/8" hole centerline is 1/2" above sway bar outer tube.
Priced individually.