Aero Seatpost Sizing?

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grellboy

Veteran
Just taken hold of a new TT frame, now sourcing parts. Anyway, thought I would start with the seatpost. The seatpost cavity in the seat tube is kind of oval/elliptical, so I'm guessing the standard measurements of circumference won't apply as seatpost will not be circular? How will I find one which will fit? Trial and error?
 

Milkfloat

An Peanut
Location
Midlands
Make, model and year of frame?
 
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