The track that Frederick shows is similar to the ones in our Oliver. We had similar tracks in our boat, and now in the Oliver. The track extends beyond the curved opening. The plexiglass sliding doors are cut slightly shorter (quarter inch, perhaps?) than the distance between the bottom and top tracks. To insert the doors, work from the back, fit first door into the upper front track, lift up, then let it drop into the bottom front. Follow the same procedure with the second door, into the back track. Simple, really.
The Oliver sliding doors are drilled out with a small hole, covered with a plastic grommet. When traveling, I slide the two doors together with the grommets lapping, and rarely have a door rattle out or move. No bungees necessary, no problem, except on extremely rough roads.
Oliver manufactures a lot of plastic and fiberglass items, and may very well have made their own track. However, you can find the similar tracks on amazon dot com for $12 to $15 for four feet. Rockler or the Knape and Vogt that Frederick posted.
Good luck. The sliders are nice, as they're light
, easy to use, and allow full access tot he cabinet, half at a time with sliders installed, full access for cleaning and organizing with them removed.