Ignition Coil purchase for Aveo Lt 2009

Hi there.
I am a newbie in this forum.

I bought the Chevrolet Aveo LT 2009 (white) recently and little by little i have being having a strange engine behavior.

I took it to the Mechanic, we drove and he immediately that the culprit of this issue is the Ignition coil. “You need to replace it”

He said that it is better to order it online because in this country it is more expensive.
I am looking in amazon but I see to many compatible ignition coils for my car model and I don't know if I should trust Amazon compatibility system either.

I just need you guys to please refer me to the correct part and better price.

Thanks a lot, I will be coming a lot here since I am interested a lot in mechanics lately.

PS: on the link below you can see some pics of the car. I guess that the ignition coil is the one that says EcoTec correct?

does the engine look good inside?

https://drive.google.com/open?id=0Bz...Ul4ZHFiVG9zYkE

I would look for a part number on your ignition coil, then search for that part number when you order parts to make sure you get the right one.