Expanding on uhloop's comment:
For dynamic loop design, it is NOT uncommon to have three (3), yes 3, limit stops on a loop. One as shown at the outer "loop width" and one each on the "loop height" legs.
Review the rotations at the support points and provide gaps to avoid locking/binding up the stops.
_________________________
Bob Zimmerman, P.E.
Vice President of The Piping Stress International Association (The PSI)