If you are looking for whitewall tyres then try - http://www.northhantstyres.com/ If you are looking for trims then - http://www.ravus.de/shopware.php or painted whitewalls - Mr Whitewalls on here
I was thinking of getting some actual white-walls but was wondering about the load ratings on any of the ones advertised. (bearing in mind other recent threads) Any thoughts on that?