I pulled out of my driveway and halfway down my street I ran over a screw. With my DD in the shop, I needed to get the tire down to Discount Tire - it's a tire warranty thing. So I used the donut out of my other Saturn and voila, it fit... mostly. It's about 4½” in diameter less than the tires on my Sky, but it worked. So they put the Sky on 4 floorjacks, fixed the flat and while there I had all 4 rebalanced and crossed.