27mm aero seatpost 1970s/1980s

[t.o.]

I'm after a 27.0mm aero seatpost - preferably campag or shimano. the post i took out *said* it was 27.2mm, so I bought a 27.2mm to replace it, but having now measured it it is definitely 27.0mm so I don't know what was going on there!

does anyone have anything suitable?

thanks!