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:
Rear Spring Hanger Kit
Product Details
Brand: Welder Series
MPN: WS28900
Thickness: 3/8" & 3/16"
For transverse mounted (early Ford style) leaf springs. Made for 3″ diameter housings and a 2-1/4″ spring. Use 2-1/4″ shackles with 3/4″ diameter bushings. The center of the spring will be 6-1/8″ behind the rear axle tube. WS20950
Gussets are designed to mount the main plate at 90 degrees to the axle, NOT at an angle for stock 1932-34 Ford springs.
Kit includes parts for both sides. In the welded kit, only the tubes come welded to the 3/8″ thick main plate.