I have a number of sagging drawers due to broken rear brackets on sliding drawers. Can anyone help me find replacement brackets (pictured below)?
You may be able to find metal replacement boots from the manufacturer but it might be easiest to add some blocking as suggested by RedGrittyBrick. If that's the path you take I would suggest creating a vertical standard as opposed to horizontal applied blocking because it bears the weight of the drawer down into the floor of the cabinet instead of relying on the side wall (which may be very thin and week if the cabinets are of low quality) for structural integrity.