1991 Chevy Sprint tire size

Tires and Wheels problem
1991 Chevy Sprint Two Wheel Drive Automatic 72000 miles

This model OEM with 165/65R13 tires. This size is no longer freely available. What would you reccomend as an alternative? The size 165/70R13 is available, but not widely available. Would the 175/70R13 work adequately though it is over 5% diameter difference.I realize that it would alter the speed indicated by 5.6% too slow. Am only concerned about brake failure. This is basically just a city car with limited highway speed use.