Hi David & Christian
All the goodies you mention is or is not on you 155 V6s are “factory options”. Often the local distributor decide which option they will make “standard” equipment on there market but this can vary from time to time. A first buyer can order a new car with more or less options if they are prepared to wait for a car to there specifications to be ordered, built and delivered from the factory.
In fact 3 variants of the 155 was produced – from early ’92 (when launched) until mid ’93 series 1 (criticized for not having Alfa road holding), mid ’93 series 2 with some mods made to the suspension/steering setup, side impact protection added to the doors and air back added to the steering wheel (maybe optional) and finally in May ’95 series 3 know as “wide body” with wider track and flared wheel arches and the introduction of either the “Super” or “S” (often referred to as Sport) with 15 mm lower ride height, stiffer suspension and shock absorbers, dark grey or black Speedline wheels with 205/50-15, Ricardo front seats, different seat covers and no woodwork on the dash, body coloured skirts and different front and rear bumpers – as options 16” Speedlines and a smallish boot lid spoiler. The 2.0 got the new 16v engine (derived from the Fiat Group new “Modulo” engine generation) which later gradually replacing the 1.8 TS and 1,7 with 1,8 TS 16V and 1,6 TS 16V. To my knowledge the V6 was only slightly modified to comply with stricter emissions levels. The S version was not offered with the 1,7 and 1,6 engines. In Sept. / Oct. 97 the 155 was replaced by the 156.