i used a racing kart place at newark to get all the bits but really you dont have to go that exotic because were expensive at the time. there are cheaper options but a little heavier. a bearings place would be the cheaper option. you can get the sprockets and carriers and the hub carriers and wheels from ebay. just make sure they are all the same size. i wouldnt use bike chain. get the kart chain its much stronger and i think it was about 15 quid for chain if i remember so not too bad.