In your profile your car is described as a 1983 Mercedes 200. Best to keep it original and hang onto the spare wheel and tyre.
It's increasingly difficult to source replacement wheels and tires for that vintage of car now. For example they may have 13/14 inch wheels with 70 or greater aspect ratio tyres which no modern run-of-the-mill tyre shop/mobile recovery service will carry nowadays. And while you're at it check the manufacturing date of the tyres you have fitted as many older cars run tyres that are past their sell by date= five-year-old. check out the wheels and tyres you have on the car and post the details on here?