I run a RN25 Hilux diff with Saab rear discs & calipers, to suit Vic PRC rules we still need to run a cable handbrake as well and the saab ones still work - even thou only the Hydralic one gets used....
the axles need to be trimmed by 3-4 mm on the spline when running a later model LSD as the axles are just a bit longer than required
The caliper brackets bolt on, and the setup fits under 13in wheels
real easy conversion - and cheap, LSD's around $250, Diff anywhere from $250???, I think they have got a bit more expensive as they have become a popular conversion
and nearly every ratio under the sun, I run a 4.89 with a spare 4.6