Thx all for all the comments.

I called the tire shop and told him that I am not satified with these 10mm and 5mm non hub-centric spacers. and that the car feels un safe. He told me that he can sell me 18mm spacers that might work perfectly for the back Wheels. i will have to wait for them until next week.

I ahve alos a strange feeling in directing the car. When i have my winter tires and the OEM rims the car is perfect, corners good, goes straight and everthing but now it feels like jumping in the co´rners. i don't know if it was because of the spacers behind or do I have a problem in my rims. I have to check them out too.

Maybe they are not well balanced. Cos' I don't see how it is possible, I know that I am not a genious in mechanics but i have the OEM tires installed in the new rims that are the same size that the OEM rims. ET35 225/40/18" and 5x112 so the same as the OEM on the new one.

And behind I have instead of the ET22 5x112 I now have ET35 5x112. And I am going to install 18mm spacers cos the bolts are a little too long with 10mm or 15mm spacers ( sounds like it when you turn the wheels when parked and car lifted up) I can make 5 and a half roud with the key to take the bolts of. so with 18mm it should be 4 1/3 if I calculate correctly.

Will see next week. but Thx again for the info's.