Originally Posted by Fe Block
The passenger axle mount shown painted red has a pan mount welded to it with two adjustment holes. The drop down mount on the driver's side is attached to the frame and the pan bar sits level right behind the front axle. This allows the bat wings to be free of any pressure and effectively attaches the pan bar to the front axle. Quarter inch angle iron with a quarter gusset and 3/16 tabs.
It is difficult to tell from the photo, but it appeatrs that the frame mount is simply butt welded to the bottom of the rail. If it is, you might want to consider gussets that come up the inside of the frame rail for strength. There is quite a bit of side load on a Panhard bar.