Replacement of internal drive for My Book Thunderbolt Duo Dual with RAID

WD External Drives External Drives for Mac
1

Where or How can buy a replacement of an internal drive for My Book Thunderbolt Duo Dual High-Speed Storage with RAID?
I live in Canada, province of Quebec.
Thank you

2

You can try this website Internal SSDs: Shop Internal SSDs for Computer, Laptop, NAS | Western Digital
or call WD support in Canada to order hard drives.