How to get a spare tire for 370Z Roadster

z me fly

I contacted Nissan North America (800-647-7261) and the girl was beside herself. She said she never knew the 370z roadster doesn't come with a spare. Long story short, she gave me $100.00 roucher at a Nissan dealer. She said I could use it all in one shot only. I could use it for service or parts.
This will buy half of the splash guards.
I have the 19" rims. The dealer found the donut wheel without a tire for $645. I guess I need to find out how the inflatible kit works. I've been hung out to dry one time already. The yutz at the dealer put on 350z locking lugs. When I had a flat the front part of the locking lug sheered off. So Nissan had to pay for towing,pay for the new 370z locking lugs and pay for the new tire. I think eventually they won't pay for stuff like I experienced.