I was thinking these guys but not sure they have 355. http://www.squadranuvolari.com/ferrari-products.htm
Some folks have switched to the clear type (with orange bulbs) and it seems to be the preferred style. You may find some folks have some spare orange ones after switching to the clear type. Do you need both? What's the law in the UK?
The Uk has no laws that dictate what lights should be, they just need to operate properly. If anyone has the amber front lights let me know.