How to get a replacement casing/tray that holds a drive within G-Raid Thunderbolt 3 RAID Array?

How can I get a replacement casing/tray/module or whatever it is called --the plastic casing that will hold an 8T drive and slide into a G-RAID 16TB 2-bay Thunderbolt 3 RAID array?? My drive was replaced under warranty, but when it was returned to me the casing was not there. Zero help after repeated tries with customer service. I cannot even find out the exact name of this tray, or the part number, or where/how to order one. Any help would be appreciated! Thanks!

UPDATE: After a ton of difficult communication, WD customer service got me the casing.

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When adding new hard drives or replacing hard drives that are not under warranty, consider using Seagate Enterprise HDD that are optimized for use with your LaCie 6big Thunderbolt 3 and LaCie 12big Thunderbolt 3. For further information about compatible hard drives, visit LaCie support.