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:
Comes off the frame at a 27° angle, but can easily be trimmed for a different angle, if required.
As used in our triangulated rear 4-link kit. Hole is 1/2″ diameter. The short side is 2-5/16″ from the frame to the hole center. The long side is about 5-1/16″. 10 gauge mild steel.
Sold individually or in pairs. Available for large (1-3/4" wide, 1-5/8" OD) bushings. Small bushing brackets have been discontinued. Spacers or extra washers can be used to mount the 1-3/8" wide bushings in the 1-3/4" wide brackets.
