1.8 LSD identification

[MX5_SDV]

Alright guys, i'm building a westfield SDV based on a 1995 1.8 MX5, i'm trying to work out if it has a LSD or not.

How can you tell without taking it apart?

[MX5_SDV]

alright, thats pretty simple then, i've got a shaft runnig across the inside, so a open diff.

Where can i get a torsen type? is there any specialist breakers?