Hello there.
I don't think we have a published options list, I have a copy of the 2002 sales brochure which has the items listed.
Chrome kick plates are an add-on, not an option as some have either used a Rover one or had them custom etched.
Door inserts were an early feature, dropped soon after to save money
Head rests were an option I believe.
The low level spoiler was an option over the standard extreme one.
Not much else optionwise as the 180 had most things unless people asked for expensive paint options, stereo upgrades, electric rear windows, full leather or anything added from the accessories brochure when bought from the main dealer.