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Evaporative tank(goes in the back of the middle bench seat)
2 longer hoses were connected to gas tank, shorter ones to filler and to unknown location :) ( did not have time to trac it down but it looks like it is going to carburetor).
i have the same dillema and although i love the stock bench seat, i would rather get rid of the canister and bench, fab up a frame and set up a nice set of buckets. Also much cheaper than reupholstering the bench.