Maybe you guys know. There is a hole in the door frames, interior, just below the top rear corner. There is a gap in the windlace track and a 5/16 through hole.
In the 49 COE I'm pretty sure it was covered by the windlace.
With the sheet metal removed for the 5 window conversion, I was making real mounting points for the upper shoulder harness bolts. Don't want to weld over or interfere with a necessary hole.