Hi:
Below is the link to the parts list for your PC.
HP PartSurfer
You probably need this part...849055-6C0 DVD - 8X SMD 9.5 UST NoBzl HLDS
You will probably need to remove the bezel off the bad one and put it on the replacement drive.
I recommend that you search on eBay by the part number and see if you can get a used but tested and working unit.
849055-6C0 | eBay
Or take the drive out first, and see if there is a part number label on the metal casing, and buy the same one.