I have a 2012 V6 mustang with 235 /50 zr18 tires. I'm considering buying a temporary spare. What should I get and where can I buy it? The local dealers were of no help and I can't find a lot of information online. I live in northern NJ. I've also thought about buying a replacement wheel and putting a cheap tire on it, but the wheels are super expensive. Thanks for any help.