Check out 'UK Independent BMW'. I think the guy's name is Nigel. They operate on Ebay and have their own store. Excellent service and quality. I live in Australia and have bought quite a few items from them including clear front and side indicators. Very happy indeed...
beem, next time u put em in, ...thisԚ´ll sound funny but seal the edges with wood glue, itll dry clear and u can peel it off if u need to take the lenses out, also screw the lenses in a little on each side at a time coz its made from acrylic and is well brittle