find some wrecking a 4x4 hilux and it will probly have a LSD in it...failing that i remember seeing somewhere that supra diff centres fit hilux diffs (older supra diff centers)
i would say its roughly one of these measurements
Regular Cab: 63.8 in (1621 mm)
Xtracab Long Bed: 66.1 in (1679 mm)
Xtracab: 66.5 in (1689 mm)
but ill try and measure the length of the diff when I'm at the workshop next...