With Stellantis (the merger of FCA and PSA) moving to the "SPM" (Service Parts Management) system, the classic ePER is officially deprecated. New vehicles (Peugeot, Citroen, Opel, new Fiats) use the "SEDRE" or "Partslink" catalogs.
Once you get hooked, ePER stops being just a catalog. It becomes a time machine to an era when Italian cars were wonderfully weird, over-engineered in places, and shared screws with kitchen appliances. Fiat Eper Catalog-