Which 2.88 diff should I use?

[toddy11143]

Hi there. I've just come into possession of 2 complete rear
suspension assemblies, both with 2.88 diffs, and would like to
fit one of them to my 1969 series 2 E Type 4.2 FHC.

One diff has an alloy, ribbed rear cover plate and a small hose in
a plastic sheathing going to each hub, which I suspect may be
for ABS (the assembly is probably ex-XJS?). It bears a rather
soiled plate saying ''Genuine Jaguar Replacement'').


The Other diff has a steel cover plate like that fitted to the
car at the moment.

I would like to fit one of these to the car to lower engine
revs.

Provided that they are in a similar condition, my question is,
which one should I use?

Many thanks,
John