You could make a filter for now:
-position: DL
-stamina
-pace
-positioning
-tackling
-dribbling and crossing if you want attacking fullbacks
Start with all attributes on 11 or 12 and adjust up or down as necessary. Tick filter unrealistic targets. Other attributes to watch for: acceleration, decisions, work rate, anticipation, marking, and anything else highlighted when you select your fullbacks on tactics screen.