I deal alot with a dealer here in Ontario and the general managers usually has access to a GM website and they have everything on there the name of that website is GM ASSET CENTRAL, I mean it has every logo, ad,vector,vehicle templates, whatever we need to print there stuff, too bad it took them 8 years before they give me access to it.
just ask them to browse along with someone in the dealership and ask them to email you that logo, I know its a new vehicle but usually they are pretty up to date