Diff Pinion Seal pn help please

I am trying to find the right part number pinion seal for this differential. It is from an 84 XJ-S. It has a drain plug and 5 bolt stub shaft retainers. I think that means it’s a Salisbury.

It has two tags. One says PS and the other says 2.88.

Is this the serial number?

I don’t have XJS books. And the usuals websites are confusing.

Drain plug and 5 bolts stub axle to case means it is a Salisbury. The latest part number is CBC6923, which is a high temp material. The part number when the car was built was AAU3381, later numbers JLM527 and JLM11526.

Dana diffs have stub axles that bolt to case with three bolts in a perfect triangle shape.

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Thanks Greg