The 2.5 peanut tank had distinctive "square" edges, that are hard to see from the side...! As for the gap between the seat and tank, I believe on this model, the tank is set back a bit farther at the steering head end, to minimize that "gap" at the seat you refer to...! Check the line where the front of the tank is compared to yours which just clears the handlebar steering head, verses the one with the setback almost 2"-3" back from the steerer.
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