18" OR 19" WHEELS

Where are you located?

The only source of new Euro Motorsport mirrors are the dealer.

This one Discounts parts to us.

http://buybmw.com/access.aspx Email Dave or Al

Wheels I can't help with.

well, have you found out if the wheels are going to rub or not yet? hehe, whats the offset? That's the most important thing. width is not a problem I'm running 17x8 up front and 17x10 in back and I could tuck them. Seriously the rears could use a 10-15 MM spacer to be flush with the wheel well and the fronts have 20MM spacers and are actually still not out far enough for me... You should be fine just check your offsets, the spring seats is where you might have the most trouble especially with a high offset

get staggered 20's they look much better

Don't forget to consider the ride quality you want.
Each extra inch makes a significant difference - as the tyres will need to be lower profile.
What is more the difference is not linear.
If, for example, an 18" tyre gives a ride 10% harder than a 17" one, a 19" tyre will be a lot more than 10% harder than an 18" one - and so on.

It all depends on what you want to achieve.