I bought this engine on ebay from velociferox.
But here is information of this engine from the guy who makes them gdetailfactory and u can contact him from this forum
http://www.automotiveforums.com/vbulletin/showthread.php?t=955528&highlight=rb26
here u can see pics of it and read about it from the manufacturer who sells it from modeller to modeller don't exist in shops.
http://www.automotiveforums.com/vbulletin/showthread.php?t=955528&highlight=rb26
Thanx for all good comments from u all
i have not chekced but i think some of my modeling friends from sweden visit this forum also sometimes and post builds.