Woud these 20's fit???
 

Front: 20x9.5 ET +45 (245/25/20)
Rear: 20x11 ET +23 (285/30/20)

I would definitely need some rolling and shaving. For the front, would I need a ridiculous spacer size? I'm guessing 20mm at minimum.

Any input? I don't have "M" fenders.

Anyone feel free to step in if they know more, but....

I think there's a challenge rolling the front fenders on an E60. I just got back from the shop and the fellow mentioned that our fenders aren't metal, but rather poly. It can be done but it's less of a true roll and more of a straightening of the angle of the fender.

Not sure if that's what you'd like or not?

Hmmm...doesn't sound like it's very visually appealing. Thanks for the info though!

E60 front fenders are aluminium and they definitely can be rolled. My standard front fenders were rolled and I got almost 10mm more room in front.

- Antti -

Are you sure you have the offsets right? It looks like the fronts and rears offsets are backwards. If for some reason your fronts are truly et45 then you will need a crazy spacer, at least 20mm. Just as a reference my setup is 20x9 et 18 fronts and 20x10.5 et 25 rears. my fronts are flush to the fender and the rears are just a tad tucked in. You will have to be careful up front because 9" wide wheel is a pretty tight fit and there is just a little bit of wiggle room between the inside part of the wheel and strut. Also those tire sizes are back wards for a e60, should be 245/30/20 and 285/25/20.

You might want to try a different shop. Like what Anzafin said our fenders are aluminium and you can get them rolled and depending on the shop even pulled a little.