The Fiat coupes all have back seats with factory belts, same for the Brava's and Lancia's, although the Lancia Zagita only has leg room for a very small child. The 124 Spider
…has a back seat but there are no seat belts factory installed as laws requiring all passengers to wear them were not passed until after the early 1980s. Fiat were no longer shipped into the US after 1982 so most spider models will not have seat belts installed in the rear seat making it against the law for someone to use for a passenger. Also the spider back seat has no leg room. The older model 850 spider's along with the X-19 have no rear seats. in memory of dad ( Full Answer )