Putting a diff into an EP91

[earney]

OK i know there are alot of LSD question etc on here but im looking some extra info.

First off i have a competition car, a 1997 starlet sportif, standard no LSD.

Im looking to put an LSD into the car but dont really want to go spending the 600-700 on a quiffe diff. My plan was to try pick up either another car with one standard fitted or pick up a gearbox with it fitted.

Now a few questions.

What cars came standard with fitted LSD's?

Will it be as easy as just changing over the gearboxes?

What different types of LSD are fitted standard and which should i be looking for?

Im just going by a few things ive read about standard LSD's, this is my first looking into it so maybe this is all way out of question and not possible at all. Any help would be greatful.