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Considering that seats are exactly the same AND the the ground distance between anchoring bolts is the same, the old-style seats are 9.1" thick, while the new ones are 6" thick. I don't believe that for one moment.

I suggest you pick up a ruler and look at 6" and 9.1". You really believe the seats are that thick? No way.
Me thinks, the seat pitch in reality is much smaller than advertised.