I've never tried, but apparently the bolt pattern is different. It could certainly be overcome, but for the same effort you might find something more suitable.
A locker is the easiest way to get a very strong diff-centre.
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from what Ive been told the bolt pattern is the same pcd but yo need to extend the pan out 15mm. and obviously custom axles.
Im going to look at the path for my rrc as i like open diffs and don't see the need for lockers if you can keep ya wheels on the ground.
Locker also mean you can get further than your mates with out them. Sounds great until you get stuck and they cant reach you!
Maxi-Drive used to make heavy duty carriers - Basically a solid 4-pinion rover diff (must stronger than oem 24-spline or P38 diffs). MR Auto may be making these if they are making MD lockers again.
Rover have had LOTS of issues with P38 ring and pinions - personally I would stay away.
For the same or less $$$ you could buy a couple of true tracks from lucky 8. True-tracks should be as strong as a MD 4-pin diff centre, and while they do act as an LSD when both wheels (on an axle) are on the ground, when you lift a wheel it will spin like an open diff. So you can still claim you don't have lockers.
been on the new today and KAM also do a four pin head to fit the series with lsd
Landrover Tuning :: Home have them for everything else so should be able to do a series one.