I'm looking for a part for a 2001 SAAB 93 2.2 TiD but I'm not 100% sure what the name of the part is. Essentially it's a sleeve that goes in to the differential which the part in the attached image goes in to:

I've been searching around and from what I gather, the term SAAB uses to describe it is "countershaft insert into diff bearing".
Any help locating one of these parts would be greatly appreciated!
Thanks in advance,
Lee.
