I think you are referring to this one:
View attachment 6006
It is a very good item, however this type of oil cooler (radiator) attachment adds more length to the oil filter mount, effectively making the filter much longer. Unfortunately your filter is already too close to the frame.
Another option might be an adapter plate without the provision for the oil filter. It mounts in the same way as the one above but the filter is remotely mounted, along with the cooler.
These are just sample photos for reference (need to find the correct size for Fiat block):
View attachment 6007
View attachment 6008
These adapters can be found individually or together in a kit:
View attachment 6009
The circuit connects like this:
View attachment 6010
This way the filter can be mounted anywhere, as well as the cooler.
You can also add a thermostatic control to the cooler:
View attachment 6011
View attachment 6012