HiLite door rollers

I think we can replace this roller, but we need to see more of it. Your photo only shows us the inside portion of a complete roller unit. There should be an outer housing still installed in the door. If we can see the whole thing, we can offer a replacement option.

In the meantime, you can see our entire selection here.

Yes, we do carry weatherstripping. You can see what we carry here.

As for switching the doors, you will have to remove  both doors from the track. The hard part is taking the doors apart and reinstalling the framing on the glass doors to match them up in going in the other direction. It may be more trouble than it's worth.