Wanted: Rear Hub & Small Chainring for polo.

And here comes the vagueness:

I'm after a fixed rear hub, flip flop would make me very happy, and I thought I needed 19h but this sounds a bit wrong compared to the others listed here. (dons flameproof suit)
Did you count the valve hole, if so you'll have an 18h rim, just search for a 36h hub and lace every other hole, hope this helps