The frame rail before modifications.
The frame rail is notched and narrowed, and a heavy plate is formed and welded in place to add increased strength.
The new DSE deep tub is clamped into position and fitted to the car.
The lower portion of the tub is punched with holes for plug-welding, and then the whole tub is welded in place.
Looks like the 335-wide rubber will squeeze right in!