I was thinking of some films where the combination of two main actors works perfectly. Here’s some I came up with:
Clint Eastwood/Lee van Cleef in For a Few Dollars More
-This is obvious and probably the most legendary pair in spaghetti westerns.
Henry Fonda/Terence Hill in My Name is Nobody
-Hollywood legend meets new european star. This will end up in history books.
Franco Nero/Tomas Milian in Companeros
-This is one of my favorites. Two great stars of the genre and very different actors together. Still they work perfectly together never overshadowing each other.
I like the two friends Peter Martell (Rafael) and Leonard Mann (Sebastian) in the
very good "Pistolero dell’ave Maria"
Enrico Maria Salerno and Terry Jenkins are pretty good in “Bandidos”.
Also the tragic Andrea Giordana and his cool and smart buddy Gilbert Roland in "Johnny Hamlet"
George Hilton/Franco Nero in “Massacre Time”