If you are talking about the fog lights I don't think it would work. The m6 bumper has air intakes where the 645 bumper has the lights. You could look into a lip to add to your existing bumper. The Alpina lip is very nice!
2014 Carrera 2S
- White/2 Tone Espresso/Cognac - Aerokit - PSE - PDCC - SPASM - PDK - Sport Chrono - 20" wheels w/OEM Spacers - Glass Roof - Leather Dash - way too much more to list
2013 E92 M3
- LeMans Blue/Black Novillo - Comp Package - MDCT - CW - PP - EPS - CF Roof w/OEM CF Mirrors, Spoiler, Interior Trim - Full IND package - Muffler Delete
2013 F12 M6
- Alpine White/Black Merino - Executive - LEDs - B&O - DA - Lots more