I have got the MK 6 degree beam with Supra diff conversion so it accepts the diff without a Supra diff fitting kit needed.

The supra diff benefits from having a weir kit fitted and mine had new seals and bearings, it made a bit of noise for about 150 miles then settled and is totally quiet now...I love it.

If you go 6 degree you get so much more traction, they handle really well. Also ask fr the bladed anti roll bar mounts to be fitted...just in case you upgrade later. The standard 7.5 can still be fitted as he doesn't remove any of those fitting parts. The Supra diff needs a rear cover replacement too but I believe MK is making these again.

Jag option is also proven to never break.

OR go big time and fit a 9 inch but I would rather spend that money on the 6 degree beam and one of the above as you get the traction and handling benefits of the beam.