I ordered the left and right tracks expecting the other track to fail in the near future.
I read some other comments on how they fixed it and it was relatively easy.
Some of the other plastic parts were also brittle and when I depressed the latch that holds the track in place it easily broke off. Both sides did this.
However this did not impact the repair that much as the weight of the drain rack holds it in place.
If I'd had known I would have ordered these parts also.