How many of the six digits in 108803 look exactly the same when each digit is seen in the dashed mirror?

In seven-segment style only 0 and 8 have a vertical line of symmetry. The number 108803 contains 0, 8, 8, 0, so 4 digits are unchanged. The 1 (its flag would point the other way) and the 3 (its open side would face right) change. 5 counts the 1 wrongly; 3 misses a repeated digit.