Removing 4 Repair NL2 Aux Tank

[PbFut]

I am not having any success with breaking free the rods that mount my aux tank. Does anyone have a photo of the hardware? Or a source? I am unsure where the frozen threads are located. I am thinking it best to grind the mounting hardware heads for the tank in the bed of the truck retaining as much of the original hardware as possible. Then replace or repair the head portion of the hardware for remounting after I clean and restore the tank and free up the hardware. My guess is that the frozen threads are in the passthrough tube in the tank. This is not a high quality restore, I just prefer to retain as much of the hardware/original look as possible. Running some althread would be fast and easy but not the look I want. The odd retainers on the bottom of the tank being the items I would prefer to save.