meanestmiata

I have a 1990 mazda miata I am doing one of the hybrid diffs using miata and rx7 parts. But I have an issue, I dont know much about the rx7 diffs. What years and models have lsds? Which types of lsds are available and what is best for performance driving? Which ones can handle what amount of power? Any information you guys and gals could provide would be wonderful.