call SAS after you made the reservation. call SAS in scandinavia if the local agent tell you that he/she can not assign exit row for you.
i reserverd 3 times exit row in advanced, and SAS upgraded me two times, after my seats were given to another person.
of course i printed my amadeus int. , and presented it at checkin. now on every eco flight on SAS i hope my exit row seat is given to someone else, as normally, after complaining a bit they upgrade you to biz.
So SAS is in my eyes a very nice carrier