i7 - v9

The i7 - v7 vamp is shared with Aeolian, so if you play this vamp it’ll sound ambiguous between Aeolian and Dorian. But the uniquely Dorian way to play this is by changing the v7 to a v9 - the 9th here is the scale’s 6th. You have a lot of creative freedom about how heavily you want to hammer the 6th, i.e. exactly how Dorian you want the song to sound.

Note that there’s no diatonic 13th for a v7 chord - that would be the mode’s major 3rd, and Dorian doesn’t have a major 3rd.