I wouldn't try it if I were you guys. We took measurements of the A604 trans differential. We didn't wanna take the chance of messing up a LSD conversion to see if it MIGHT work.
AS A SIDE NOTE
Our diffs are VERY EASY to get to. I didn't remove it by myself but the shop buy told me that all I had to do was remove the side cover and the bolts around were the axles go into.
I'm going to be workin with a few friends to make a LSD conversion available for our cars.
I'll keep you guys posted if you come up with anything.