The square tanks may not fit as well as the factory shaped ones, but on all the 3 row champions & one 4 row I have used or helped install in friends cars they fit in the rubber isolators & shroud without any issues or mods.
The tanks sits right in the center of the isolators... the very ends of them dont curve around & hug the tank as well as factory shaped tanks but thats a non issue in my experience, the radiator is fully supported by the rubber pads & fits the shroud on 2nd gen firebirds very good, no cobbling to make it fit.
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