Does anyone know what module I need to maintain Onstar functionality in my 2008 Saturn VUE?

When I go to Crutchfield, it says my vehicle hasn't been fully researched and give me a list of all GM modules.

I've searched around here a bit, to no avail.

Thanks in advance.

Metra GMOS-LAN-01 non fact amplified, Metra GMOS-LAN-02 if your vehicle does have a fact amp.

www.metraonline.com

So I contact Crutchfield in hopes of ordering the above listed parts, and I'm told neither (actually nothing) will work for me.