Yeah that's the stock size on lesser Foci , and personally that's what I'd use and /or suggest ......though I do find your information interesting just the same however! I'd be thinking the 185-70'S (which was on the Tempo) would be too large for the car and would rub when turning (visually they'ed certainly look odd ...)
For the record the stock sizes are 185-65-14, 195-60-15, & 205-55-16.
I guess Ford doesn't follow the usuall standard +1 and/or +2 upgrade scale ...