I got some carbon fibre ones for my 640d off eBay and they fit straight on. The old tips pull off and these slide on and bolt up tight. They look really nice and really improved the look. The inner diameter was 68-71 mm and they fit perfect.
The seller on eBay was Jasmia09 and I went for the shinny stainless steel inner with gloss carbon fibre outer. They also have the M logo etched on the top. Very pleased with them and the quality is great. Picture does not do it justice.
Cheers
Jim
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