For others who do want the spare tire option, in addition to the provided "no-spare" equipment Chevrolet offers, I have a donut spare, scissors jack, lug wrench that all fit nicely under the luggage compartment false floor for the times when I was driving some distance out of town.
So, approx $200 later, I have an actual donut spare tire. Fit tested on my Left Front tire position to make sure clearances were all good and the factory tire wheel lugs fit as well.
I'd posted all the wheel, tire size information under Oldskybolt a couple weeks ago. Check it out and I hope this helps.