HELP Bmw e36 323i differential size??

[Charlywantz]

Hi, I have 1999 bmw 323i. And I'm not sure what size the diff is. I thought the diff, was midium. But after talking to someone on a selling site, they think it might be 168mm. Which I think is small case.
PLAESE HELP!! THANK YOU.

 

[Gogzy]

medium case. 2.91 or 2.93 ratio cant remember

 

[hotrodrick]

2.93 medium case (188mm)