Measure the seatpost size if possible. This will tell you if it's up in the PX bracket 26.4 is good, if smaller then look down the range
I'm assuming that's down to a standard tube OD and then different thicknesses of steel is it?
I noticed that the heavy Cyril Guimard straight gauge frame in my loft is 25mm seatpost while the Gitane vitus 980 frame I ride is 26.4mm
@AlexD started
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Measure the seatpost size if possible. This will tell you if it's up in the PX bracket
26.4 is good, if smaller then look down the range