I've learned over the two years of owning my 6, that RPM (Donny) is probably the best bet for any Mazda6-related accessory. Yes, he's in the US, but I'm afraid the only other option is to visit a st... sorry, dealership.
Sorry, Donny's forum name is falcontx, not RPM. RPM's the name of the company.
In any case, the forum sponsors are your best bet. Local accessory and part shops hardly stock anything for the 6.