DELL PS 6100E, 3 disks with errors

Good Morning.

In our corporate matrix 2 disks has broke down, model MK2001TRKB. We have 12 disks (same model) in RAID 50. I know that the disks are no longer on sale. Could you advise me on what disks (which model) can I change the damaged disks to fully recover my RAID? It has DEGRADED status now.

P.S. Sorry for my bad english.