extremes a funny one, early ones were spec'd quite well, later ones wernt so well spec'd (the extreme 3 iirc didnt have alloys but had fogs and rear spoiler) extreme 4 had dynamique styling, sports front seats, cheapo back seats with no headrests, trip computer, manual wing mirrors, no rear speakers where teh extreme 2 was pretty close to dynamique spec but with the horrible colour interior. with extreme 4 cd player was standard, air con optional, exterior temp guage was optional iirc, deffo not standard.
expression has rear headrests, electric mirrors, no sports seats, 14" steel wheels with wheeltrims, no fog lights and no rear spoiler so the back looks like a bauld mans head! cd player was standard after 2004 i think, option from earlyer on
authentique is the most basic with 1.2 8v engines (60bhp) and think their was a DCi65 option? these have a tape player and dont have the screen on the top of the dash like the higher models that displays radio station, clock and temperature
later (after mk3 clio was brought out) the Extreme 4 was renamed campus sport and can still be bought today, later ones after 2006-ish (i think) have a different front bumper and a smothed rear boot with the reg plate on the rear bumper. 1.2 16v 75bhp engine was availible and possibly a DCi65 (i think)
Campus (not campus sport) is only avalible in 1.2 8v (60bhp)engine, no alloys, fogs, spoiler etc no sports interior either