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:
Transmission Mount Plate
Product Details
Brand: Welder Series
MPN: 70007
Thickness: 3/16"
Hole size: 7/16" slots
With two slots for 7/16" bolts on 1-½" centers for a GM rubber insulator. Overall size is 5-½" wide x 4-¾".
Used in the #WS70013 mount kit.
