Re: 156 questions
Hope this helps you. I sell 156's and know them pretty well.
Standard 156 has 15" alloys, cloth seats, climate and no spoilers.
Lusso (or lux spec) gets the same alloys as above but comes with full Momo leather interior, wooden steering wheel, gear knob and centre consol.
Now the sport versions can be a little confusing dependant on the age of car. Veloce and sport pack 1 consists of the following. 16" teledial wheels, lowered suspension, side skirts, red and black dials, leather steering wheel and gear knob and carbon effect centre consol. The seats are the same cloth that you fine in the base model.
The sport pack 2 and veloce with recaro are as above but with recaro cloth interior.
The sport pack 3 and veloce with leather are also as above but with full momo leather.
So SP1 means cloth, SP2 Recaro, SP3 leather. Absolutley nothing to do with spoilers. Spoilers are a dealer fit option and can be fitted to any spec 156.
Hope this helps.