I had some left over Closet Maid Shelving and a few brackets.  Ordered this pkg. knowing I would probably need more.  There seemed to be a difference in the older brackets I had as compared to these.  We were putting the brackets up above the shelving (due to the space we had for shelves) instead of below and noticed the old ones worked better.  We ended up using only one from this pkg., but needed that one.