I have a really good condition Mazda LSD left over from Spec7 spares. It is ready to install in your axle housing. I also have the axles to go with it, but not the housing. $100 takes it. Can send pics as needed. Its better to text 720-212-5838 than PM.

what year is it out of? There are two styles 79-83 small axle and 84-85 big axle.

Also, the 12A motors had a 3.90 ratio while the 13B motors (GSL-SE) had a 4.10.

I meant to check today which axle size and ratio it was, but I didnt get to it. I will check tomorrow AM if I remember.