I just all my bulbs on 2017 M240 (pre LCI):
Front size you want PY21W (also called BAU15S). These are the same as 7507 except the two pins are 150 degrees apart instead of 180degrees.
This is the exact bulb I bought for the front:
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
There are 3 brake bulbs and one emergency/secondary brake bulb(used as fog in euro cars), one turn signal, and one reverse PER SIDE. The 3 brake bulbs, the turn signal, and reverse are all 1156. The secondary brake bulbs is H21W. I used red for the brake bulbs because I was told the brighter white LED will make the brakes look pink that you need red to keep them a dark red. I tried using amber for the rear turn hoping it would look for yellow (I hate red turn signals) but it looks red anyway so I should have just put red in there. So you will need FOUR red 1156 (3 brake, one turn), one white 1156 (reverse) and one red H21W (secondary brake) per side.
Here are the exact red 1156 I bought (two per order):
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
Here is the red H21W:
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
Here is the white 1156:
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
Before you order, remember I have a 2017 so make sure yours are not different. Also I have bimmercode so did not care about the cold or warm flashing checks. Some of these bulbs are listed as "cambus friendly" so without coding they might or might not flash, I dont know.