What is this part called?

[YK1980]

Hi,

I lost this cap while go for car servicing. I am looking to buy it but I am not sure what the name for it. Anyone can help me up and where can I get a new replacement? Mine car is Aveo yr.2004.

Thanks,

Derrick

[Aveo5_boy]

It's the top cap....# 13 in the diagram is what you need --> 2004 CHEVROLET AVEO Parts - GM Parts - Genuine Replacement GM Parts - New GM Parts

[YK1980]

Hi Aveo5_boy,

Thanks for the info..