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:
Model A Frame Parts
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Model A Parallel Rear Four Link Kit
C$490.00
Model A Parallel Rear Four Link Kit
Available for stock and aftermarket frame rails