Rear mounted drawer glide bracket.

I have been unable to find a bracket with this many adjustments and this large of a back plate anywhere. There are no markings on the bracket. From original installation, a shim has been added to the wood at back of cabinet and the outside is the back of the island. As this is used to support s large drawer holding 2 recycling baskets, it needs to be sturdy. The same bracket is used on all of smaller drawers in my kitchen with no problem.