Janus,
You can get the complete roller rocker assembly with the end supports from CompCams. Here's a link to that set up.
http://www.compcams.com/catalog/284.html
You can also get a pretty nice roller rocker set up from ErsonCams. Here's a link to that set up.
http://www.mrgasket.com/pdf/Valvetrain.pdf
Both of these parts are available through Summit. I suspect Summit will ship internationally but I'm not sure. Both set ups are pricey. The Comp Cam set up is about $1000 and the Erson set up is about $600.
Chris