MX5 Cooling & Rad

[Dave F]

I'm looking at buying a Radiator over the next week or so and was looking at the options. My initial plan is to use an 190e (http://www.ebay.co.uk/itm/122141245444?_trksid=p2060353.m1438.l2649&ssPageNa me=STRK%3AMEBIDX%3AIT) I believe it gives better cooling than the polo Rad. Looking at it though it has a top and bottom pipe but no small top pipe. I plan to use a polo header tank that will be T'ed into the back of the engine where the heater matrix would normally be but where would the top 'overflow', if that is actually what it is, go? I hope this all makes sense and I always open to any other options