How aggressive of a look are you going for? You will not be able to achieve that look using non-staggered wheels.
18" 8.5 5x120mm Offset: 35
- Will be fine. Just make sure the hub bore is 72.6. Using this set up you will be able to rotate your wheels to extend your tire life.
18" 8.5 5x114.3mm Offset: 38
- WILL NOT WORK. BMW bolt pattern is 5x120.
18" 8.5 5x114.3mm Offset: 45
- WILL NOT WORK. BMW bolt pattern is 5x120.