I might have to replace my front bumper cover so if I do, should I get a M5 bumper? Is it an exact bolt on? I also have the headlight washers. Do I need to get new fog lights or will the ones I have fit the M5 bumper?
What is the part number and who should I order it from? Thanks.

It should fit, I am currently going to do the same mod. You will need to buy the foglights, and the hardware, also the fender liners.

Bekkers has them on their site.
http://www.bekkers.com/Merchant2/merchant.mvc?Screen=PROD&Product_Code=BICM5E39FRT&Category_Code=be39aero

yes, lots of people have done it. Im not sure if its exact bolt on? you can get part numbers from realoem.com