How to buy an used wheel, what size, what are the crucial numbers?

[amoretto]

Hi everyone,
I have Aveo 1.2, year 2007, bought in Europe, Croatia.
Tires are 185/55/15. Wheels have 4 screws.
I have to buy a wheel, used. People in the ads usually write 15", 4x108 or 4x98 or 4x113 or else...
What is the proper size for my car. How can I tell when I have a wheel in front of me?
Thanks

[petrified.rabbit]

your car is 4x100. 56.6 center bore, offset is determined by which wheel you have.

if you are just buying one replacement wheel, you need to get an exact match.

[amoretto]

Thank you very much