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:
Parts & Pieces
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Axle Bracket Plate - Pro Street Four Link
C$52.00
Axle Bracket Plate - Pro Street Four Link
For 3”, 3-1/4”, 3-3/8” axle tubes