Rats! I came here looking to find out what they were called. I have the same exact drawers.

The shower door rollers I found were too big for these guides. I'm still determined to find these things ****** somewhere.

*One thing I will mention is I noticed that our awkward base cabinet in the corner which just buts up against another has a front for 2 drawers, even though the other half if joined with another to form the corner. If you crawl inside you should notice that the drawer slide AND those guides should be there. If you only need 1 set then there's a place where at least 1 spare set may live.

Of course I need 3 sets.

Now off to the hunt...