The retainer is open sided, and has upper and lower walls with notches for snapping into place in {HEAD ~ an aperture} in {TAIL ~ a mounting channel} in which the shelf bracket is mounted and in overlying relation to said bracket 
The retainer is open sided , and has upper and lower walls with notches for snapping into place in { HEAD ~ an aperture } in { TAIL ~ a mounting channel } in which the shelf bracket is mounted and in overlying relation to said bracket
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH