The QRL Quick Release Latch is designed to interface between the Happy-Trail top plate and top box. It allows you to quickly and easily remove your top box from the bike and put it back on just as easily. Locks with two padlocks (not included).
The QRL consists of two plates one on each side of the box(see additional photos). Each measures 8" x 5.5".
Requires a Happy-Trail T2 or T3 top plate (see bike specific products) and
top box (sold separately).
All Happy Trails products are crafted in Idaho
You would need the Tail Plate to mount the QD-2, check it out HERE
The Instructions have a complete list of the hardware that is included.
What model GS is it