Here's my pictures. First, a reference picture:
Looking inside that hole you can see the black tab that bolts to the dash, that is one of two tabs I made to connect the pedal hangar bracket to the dash. The other one is behind the speedo.
This last one is from the passenger side looking up at the driver's side - side view:
One other thing that helps triangulate everything, is the factory brace for the cowl vent, which attaches just to the right of my new brackets.
This setup works good and has no noticeable flex...and my 49 has the firewall with out any beads rolled in it so it's a flat piece of sheetmetal...ie. no strength coming from there. I've been driving the truck since July, so I know it works!