Each car has 2 options for the filter as shown in the image.. 71736158 or 46805832.. One is a quid cheaper and weighs nearly 1/2 as much more than the other...
The 7 series numbers are 3rd party consumables (can't remember the italian word) and his parts dept don't use them. The 4 series numbers are genuine Fiat parts which have been used since the cars were built. Same oil filter fits almost all JTDs.