If you are talking about the door tracks, I got my original ones from here (but I couldn't use them):glitch_in_the_system":6ec9a said:Where did you find the sliders for the plexiglass?
http://www.amazon.com/M-D-Building-Products-Aluma-Slide-Sliding/dp/B00173CQ7O/ref=sr_1_1?ie=UTF8&s=hi&qid=1230873116&sr=8-1
Then I found a local glass shop that cut the glass and provided a specific track with rollers installed on each door. This makes the doors open and close really easy. It's great. The only potential downside (that hasn't actually happened yet) is that there is a very slight gap between the tracks that a small cricket, roach, or curious worm could squeeze through. Now my BD eats bigger feeders so I'm not too concerned about them fitting inside of that gap and he doesn't eat crickets anyway so it works out.