This is the one i am using with 2.0lt zetec. actually VE 334 1.4 /1.6 golf 50mm wider than polo and still fits, also accepts sierra fan switch. £28.70 uk post free. http://www.adrad.co.uk/prices/prices.php?search=VW334
I hadn't noticed until seeing these that the bigger radiator does not have the small pipe out of the top of the radiator. I have that one and it has been a bit of a pain to get all the air out of the system which would not be an issue with the smaller radiator. I made an inline air bleed in the top hose to get the air out.