XBOX One BD Drive belt replacement part

I have a Xbox One which has a faulty BD-Drive. I opened the drive up and upon inspection I noticed that the belt at the back was torn (Not the gear belt towards the front of the drive). After searching far and wide on the WWW I was not able to find out what belt I need to replace it with.
So my Question is what belt do I need and where can I find one?
I would really appreciate the help.