In the screenshot from Tutti i colori
, our "Unknown Sleazy Man" (who, btw, doesn't look sleazy here) is the cop all the way in the background. But the guy between Fenech and Hilton is Cesare Di Vito.
I am very sure that it is Di Vito in all the pictures - he is just younger in some of them (obviously).
For comparison, here are some additional pics of him from Mandinga
...and from Detenute violente