a really easy irs to find is from a toyota cressida, they use the same style center section that a supra uses and there readily availible everywhere... oh and most of them are limited slip...
im building a truck for my buddy that has a cressida rearend with inboard brakes (thanx max for the motivation)...
PHATTYS FABS.
phattys_fabs@shaw.ca
403-999-8602