Likit patio door roller

I have 3 sliding glass doors manufactured by Likit, which went out of business. The rollers are shot. How do I ID the correct roller for these doors? Or do I replace the entire 4 foot roller assembly? Do you know how many rollers these doors have top and bottom?
Thank you.
Kelley

I see you have 81-265 as a replacement for Likit sliding glass doors. But do you have a replacement that includes a metal wheel instead of the plastic wheel?

Oh, and preferably with actual ball bearings too.