I don't know what stock Toyota wheels the college kids found to convert to the 15" wheels. They did, eventually, make it work.
I don't remember the bolt pattern (off the top of my head); But my 2000 Hyundai, Sonata, had options for both 14" and 15" wheels. Long story; But tried to find a 15" wheel for it while on a 3,500 mile trip. All I could find at the wrecking yards were 14" wheels. Bought 2 14" wheels and tires and put those on the back (front wheel drive car). Interesting, to say the least! But I managed to complete my trip until I got back home.
As Randy mentioned; There are options for new wheels out there. Going to blow up your budget; But I am sure there is something out there that will work for you.
Steve