ePer is the spare parts catalogue to look up part numbers and to get some indication as to whether parts are still available and what the cost might be. The requirement to order multiple items rather than just the 1 or 2 you might want is set by Fiat and the dealers just have to follow, but often I've been told I have to order 5 of an item but end up ordering and paying for just the 1 I need. You just have to try on a part-by-part basis...
Also, many small fixings can sometimes be difficult to locate using ePer.
1996 Portofino 20vt & 2000 Pearl White Plus
1985½ & 2016 2017 Fiat 124 Spider + XF Sportbrake