15 year old drawer slides

I need 2 sets of drawer slides as shown in the attached pictures. I tried the EZ Go units, too cheap made. I have been looking for these for weeks now and have had no luck. The biggest problem is that I only have a 1/4" on each side of the drawer and even less on the bottom of the drawer. Whatever I use must be completley flat with the bottom of the drawer as well as the track. There are no names, numbers or markings at all on the old tracks. Thanks for any help you can provide.