Book-Live Duo, WHERE TO GET SUBSTITUTE DRIVE?

G-Technology G-RAID & G-DOCK
1

My Book Live Duo
P/N: WDVBHT0040JCH-00
N/N: WUZ232000463
3013N R/N CBC BAAAFEB

RAID Configuration, Drive A is faulty

NO WARRANTY CASE
WHERE DO I GET THE RIGHT DRIVE?
WHERE TO GET THE RIGHT SPECIFICATION AND PRODUCT NUMBER?
WHERE TO ORDER IT?

LIVELY IN AUSTRIA/EUROPE