Hi, yes two hooked rods, drop the frame over the battery so the rods go up through a holes in the end of the frame, then two nuts to hold the battery down, and finally the cover and knobs. However don't tighten the nuts down too hard because it puts too much load on the box and the top flange of the box can break away and the battery could potentially end up hanging on the cables. I welded a strap or cage affair under my box to take the weight better.
Colin