Need help , i have a 2006 E90 320i europe with wheels from factory :
double spoke style 156 size 16 x 7 with RFT BT Turanza 205/55 ET34

a friend of mine is selling me a style 128 not oem , a set of 4:
spider spoke style 128 (replica see picture) size 18" x 8.5 j 225/40 R18
he has those in a 328i.
i read some people say they recommends rims for E90 in 18" size is:
front 8 x 18" 225/40 r18
rear 8.5 x 18" 255/35 r18
http://www.kalach.easynet.be/style/style_189.htm
Issues:
1. can use 8.5 X 18" size in front ?
2. do i need put any spacer in any of the rears to adapt them?
3. can i use RFT tires for Rims 18"?
4. will have issues with my engine (2.0) or direction/suspention problems for the wide of the wheels?