hi phillipa,i had exactly the same problem with mine, i bought 2 from germany lhd,i smashed the lenses with a hammer because you wont need them anymore,and cut up my old headlights from the back to keep the lenses,i bonded them back in with sealer and they look gr8,there are diffrences between the bis and the aircooled lamps though,the aircooled have 2 seperate bulbs and the bis have just one,it is really simple to do the conversion,i did it as mine failed its mot on rust on the inside of the lights and didnt fancy stickers on the new ones
hope this helps