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 crossmember plate
Product Details
Brand: Welder Series
MPN: 211511
Thickness: 3/16"
Hole size: 7/16"
4-1/2" x 2" with two 7/16" holes on 3-1/2" centers. Weld to a rectangular tube or purchase our #211512.
"Short" option: 7/16" bolt centers are 3/4" below crossmember.
"Tall" option: 7/16" bolt centers are 1-3/4" below crossmember.
