I own one of these, not entirely sure whether it's a Vantage 1.0, 2.0 or 3.0 to be honest, although as it came with full LX i think its a 2.0.
I measured the seatpost as 30.9, but having bought a 30.9 post this seems to tight - not far off, but i would need to force it in.
I've had a look at...