MDC-2 recommended IV values?
You can use those values more than once and there isn't much of a reason to choose another pair – except longer values for a cipher with a larger block size.

The only real requirement for the values is that they differ. However, if someone found a fixed point or other cycle for MDC-2 with a given block cipher, they could choose that point as an IV and be able to generate collisions for any string. That's why using a pair of non-suspicious nothing-up-my-sleeve numbers is better.