I wish I could identify the manufacturer of the shed for you but it came with the house. It also only came with a single shelf bracket. I assume the others were broken as this one was over-weighted and showing clear signs of stress. What I designed was an adapter that converts a cheap hardware store shelf bracket to mount into the pole grooves and the pins rest in the designed stops. Three 8x32 1/2" pan head bolts hold the bracket in place where a 1" similar bolt provides strength to the T.