Rear axle: LSD or not?

I have been investigating unsuccessfully to know if the vintage V8 Masers using a rigid Salisbury rear axle, (QP1, Ghibli1, Indy, Mexico) were equipped with a LSD.
It seems that the Ghibli's were fitted with one while the Indy's were not (or maybe as an option only).
Anybody can bring some light on this?
Also would a LSD retrofitting on a 4900 Indy be eventually possible and do you think that would be worth?

 

So it would seem that it was an option on the Ghibli also...
I have looked in the Spare Parts manual of the Indy and in the picture here under the optional LSD is figured out as the group number 31:

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Interesting.
Have you ever experienced its presence, say on slippy turns?

 

To update this thread and for the record:
I had to replace my diff because of broken and loose attachment bolts between crown and carrier.
I was fortunate enough to source a Jaguar/Salisbury LSD that had been reconditioned, for only 350 EUR, it was a good deal.
See the story there:

It was fitted like a charm, actually I believe it is exactly the same diff that was offered as an option for the Maser GT's of that period.
See here the original open diff and the Jaguar LSD with the crown already bolted on but without bearings yet:

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Now just to be driven when the restoration is completed

 

Yes indeed, and it is of the clutch style.
Though it seems to be a different model with a different assembly of clutches/plates compared to the Jaguar/Salisbury model mounted as an option on Indy's or Ghibli's and as standard on the Khamsin.
Here are the exploded views in the parts manuals.

For the Khamsin:

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And for the Bora:

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How is it tuned in the Bora, or said differently how does it behave in terms of understeer/oversteer on turns during braking and during acceleration?