1. Check Ebay.. dont expect much in the way of quality tthough.
2. dont bother. #1 it looks stupid and #2 you cant do it with the gas tank where it is. Look up Eisenmann (SP?) exhausts.
3. all the same except E39 M5 which has the M grill, dont bother with fenders... look into upgrading headlights to 2000+ E39 style w/ angel eyes if you have money burning a hole in your pocket.