v10 seat post size?

[CAR55]

Can anyone out there tell me the seatpost size required for the old V10.1 ?
I'm building up an old girl from a frame bought here....

 

[Reubs]

I think its 30.9

my 2004 vpfree was 30.9 and that has remained across V10.3 and V10c

 

[CAR55]

Thanks mate.
crc here i come...