Same issue here...
The furniture seller where we bought our (pretty darn expensive) bedroom set from told me that the drawer slides were not covered any longer because the manufacturer does not use the same parts any longer. WHAT?
so, it still falls under the same 5 year manufacturers warranty for everything Other than the plastic slide parts breaking under normal conditions.
Parts cannot be ordered, and the replacements that were recommended do not fit.
Hopefully the metal slide can be modified to fit the heavy duty socket.
I'll let you know.