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, Formed
Product Details
Brand: Welder Series
MPN: 70015
Country/Region of Manufacture: Canada
Thickness: 3/16"
Hole size: 3/8"
5-½" ID x 10-1/8" long. Holes are for 3/8" bolts. Slots fit #2268 GM insulators.
Designed to be used with our tubular center section kit. See related parts for a kit which includes support bars and tabs to mount this bracket to a tube.
