Probably from a muggins like me who spent hours filling the bottom one with a file. Its not easy with incorrect tools but who wants to buy a dremel tool for one use. It fit nicely in the end though, still not perfectly, but better than most I've seen. I sold it on ebay and mentioned it was modded for cooper. Also you need to cut the clips off, you can ask BMW to cut the clips off and they will do this and then you can file it down with patience and continuous checking.Hi there, where was it you bought the lower grill pre-modified from?