looking for new track

Hello there!

Take a look at our 23-270, 23-271 and 23-272 bottom tracks for concave rollers. Look these over and see if they match what you need.

I'm afraid your original track is discontinued but the tracks I linked you to previously is our suggested substitute. If you want to be 100% certain, show us your roller and that will help us confirm. 

This indeed looks like a concave roller wheel, which is compatible with the tracks I linked you to previously. I've also attached a video below that goes over the differences between convex and concave rollers and roller tracks. Take a look and let me know if this helps.