Wanted: Carbon track frame size 53-57

Carbon track frames ala bt edge, felt tk1, Dolan df4, Fuji elite or so.
Maybe trade with cervelo t3 size 53 or cash.

BT carbon track framset 56

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I have this Carbon Zone Aero

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Just out of interest why such a wide size range? I would expect that if 57 was correct then 53 would be very unsuitable and vice versa.