I'm looking for just what the title says. I've found the part number 68051987AB online for the 18" rim, but it doesn't tell me in the description if it's the 18x8 rim and not the 18x4.

Does anyone know if that's correct part number for the full size spare or what the size is including the offset so I can find a suitable substitute?

BTW, the background info is that I bought a used 2011 Crew that has a donut spare. I've ordered the OEM tow receiver/harness and want to ensure I have a full size spare before I start towing.