Audi: chrome exhaust trim

hi i have a 2000 B5 2.4 a4 im looking to buy some chrome exhaust trim is
there any where in uk that sell them (my be online) tried the usual halfords
and motor factors they all seem to sell the cheepo looking one that will
rust in a matter of weeks. ive seen bmws come as standard on there cars
would they fit? my diameter of my exhaust is 59mm