Oh yeh?
Take the fuel pump out and stuff in from underneath.

Cubes are good - the ones I bought are here;

http://www.ebay.co.uk/itm/ws/eBayISAPI.dll?ViewItem&item=320510415384&ssPageNam e=ADME:L:OU:GB:1123

sorry but no one has said if you fill it to the top - ie you can see it with the cap off...

Used to be able to see it from the filler hole on my 1098S dont think it makes that much difference on a DD bike unless your filling your tank to the top, natuarly any petrol not in the foam will slosh around

Thanks mate.

cheers mate.