My 2001 Sentra SE came with Firestone 195/55 x 16 tires. I need to replace one and no one makes that size, except Firestone. In all the Firestone stores in Columbus Ohio there are only two tires in stock and they can't find them. Any ideas for replacement sizes? Nissan dealers can't decide between 205/55 or 195/50. No help from national customer service. They hung up on me when I complained about availability. HELP!