Plastic drawer guide, one on each front edge of the cabinet. Nailed in place, (not very well as you can see.)
Casey from SWISCO responded:
July 10, 2019
Hello,
We don't carry your exact drawer guide but many of our customers have had success with our 32-083 and 23-114 glides. Take a look at the dimensions to see if one of these will work for you. Thank you!