Merillat Drawer Socket
Thanks for writing in! Your drawer socket appears to be an old Merillat drawer socket. Unfortunately, these are no longer made but the good new is we have two possible solutions that should work well as a replacement.
Something to consider is that the old Merillat socket is has two posts that allow it to plug into the back wall of the cabinet. With that said, you will need to drill new installation holes to install the new sockets.
Carefully review and compare the dimensions from the 32-119 Grass Adapter Bracket Pair as well as the 32-012 Rear Drawer Track Socket to see if either of these could work as replacement for your brackets.