Not sure what sort of bed tray track you're talking about? I don't have a bed tray (and likely don't have a track!) but maybe you're talking about something which mounts to the utilitrack channels in the floor? More info might get more response. Might not, if you have an accessory few of us have.
This is what the tray looks like. I cant figure out how to post a pic. It has 2 sliders made of fragile plastic that goes into the bottom tracks. I figured someone else has broken one, and has a good one left...like me. Its very handy for groceries and stuff. It has a bungee net over the top. I just need a track.