I went to look at one yesterday, which I didn't buy, but noticed several odd things missing which I believed to be standard on the Series III.
Power windows in the front only - I thought they did away with that in anything above the Forte in SIII.
Non
IRS - Definitely thought
IRS was standard on all XR's SIII
I didn't think to check (nor would I know what to look for) if it had the optional LSD, but based on the other things missing, probably not. It did have the plastic/fibreglass side skirts, but not the grey insert type, and the rear bumper was not the wire mesh either.
Brave bloke to turn down a cash offer only $650 short of his asking price.