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I don't think there is anything wrong with the plastic tanks. Up to 01 Ford used metal tanks, so you know that cooler is out of a late 01, 02 or 03 truck. It should be in decent shape if it hasn't been in a wreck.
I don't knbow about the F-800 cooler, but people are having some success with the 6.0 cooler in the 7.3 trucks.
the f600 cooler would take just a little too much work, i would have to build a cable hood release, or move the lever for mine and it would come down pretty far i think im just gonna find a aluminum psd IC, just been having a hard time finding one fore a decent price, all the prices ive gotten so far on used ones i may as well go buy a new one.