Hi & welcome to the forum, if you put your car details on your profile such as the reg no, chassis no etc, it'll only be yourself that'll be able to see the details there's an excellent tool on here called
ePer, once you've added your car details click on
ePer then click on my vehicles, your car details will come up with the original build date, spec etc & from there you can get every part number for every part specific to your Seicento from your chassis no.
As the Seicento's & Cinquecento's are getting a little difficult to get some parts for, I can highly recommend 3 company's for parts for the Cento's
1) Shop4Parts:
Highly recommended & the forums favourite parts supplier, I use them quite often as if you're a
donated member you get 10% off every order so the
donation pays for itself, if the required part is not on their site I've heard a phone call to them can be very successful although I've never had to do this
2) Italiparts:
Another company I have recently started using since I got the Seicento, I can highly recommend this company if you are after a genuine part for a classic Fiat, Alfa or Lancia that's a bit hard to find, they only source & sell genuine parts & also if you are after a part that's not listed on their site it states they'll try & source it for a reasonable price, they are reasonably quick at responding to any email as well, I recently had to change the fuel pump in my Seicento as it was whining & with my car being a MK1 899 SPI its a bit harder to get some parts for than the 1108cc SPI or MPI cars, an aftermarket fuel pump online was about £90 & Italiparts had a new old stock genuine pump for about £100 so I purchased the genuine part instead of the aftermarket pump as I like to use genuine parts where I can & was delivered next day
3) Ricambio:
Ricambio in Wallington, Surrey they specialise in original Fiat 500's but they also do parts for other old Fiat's including Cento's & I've had a few parts from them with very quick delivery & they're also quite reasonable on prices.
So these are the main 3 companies I use for Cento bits other than eBay or finding cars that are breaking, hope this helps.
