Hi
PCD is 4X98
ET or offset is depending size wheel : for 15x6.5" = 43
16x7" = 41
17x7"= 41
When you place 18" (7.5" or 8" width) you go below 40 better 35.
http://www.rimstock.co.uk/rimstockframeset.htm
Link will show you some possible measures
Stilo JTD 3D (115HP) Dynamic Steel Silver, Leather, Nav+, Spoilerkit, Comfortpack, Auto airco
Alloys HR-Alurad Brio5 18x7.5"