So I see some of the XJ81 (XJ12) cars noted as having "sports" or "Sportsline" and others not, perhaps having "comfort" suspension?

I think I also read that all the USA XJ81 had the sports suspension. But I'm not clear if this accurate, and now one would even tell.

Does anyone have any other information on how to tell if a USA spec XJ81 has either suspension/handling package?

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My understanding is that all of the USA market X300/V12s had the comfort suspension, not sport.

As far as I know any X300 series with sport suspension will have the rear anti-roll bar. And, I think the sport-calibrated shocks were green.

Cheers
DD

 

I can't say this applies to all US XJ81's but it's not listed as an option on the info I managed to get from Jaguar for my 94MY car.
it's fitted at least to the front as the ARB (anti sway bar) is 25mm rather than the 23mm or 24mm.