Heater Box Mounting (with J-Hook)

I am in the process of repairing my heater box as I restore the unit. The bottom of the portion of the box below the cowl seal and fresh air door was broken out where the retainer rod/J-hook attaches to the box causing the box to sag and not seal at the cowl. I was wondering if anyone could share a picture of exactly how the J-hook attaches to the bottom of the heater box? I want to make sure that I have the hole on the bottom side correct after repair. If you came up with an alternative type of mount or hook to hold the box up to the cowl seal I would appreciate any pictures of that as well. Thanks.