Dayco which are belt manufacturers do a belt for the K8 for £74 so if money is tight then..
im sure Data would agree the Dayco belts are one of the best out of any other non manufacturer belts
http://www.ebay.co.uk/itm/400588363065? ... 26_rdc%3D1

Yeah...from what I hear they are probably one of the better after market ones. But I have to say I've never used one. Folks that brings their bikes to me usually ask for oem parts.

you only have to go the their website to gather how large they are as a major player, not sure whom manufacturer has their belts as standard but it will probably be quite a lot.
http://www.dayco.com/