What size tires do I need for a 1995 Mitsubishi Galant? I don't know if the tires I currently have are right.?

I am wondering FOR SURE what size tires I need? One just went flat and the other is on its way out. I am not really sure if the ones I have are correct as the man I bought it from seems to have improvised a lot of things on the car prior to selling it to me.