Need help IDing 1950's Pirates Photo - Clemente

[smtjoy]

Hi All,

Happy to have gotten this early Clemente spring training photo (wish the condition was better but still a nice clear photo), working on the year but from the players I can id it looks to be 55-57ish, hoping to ID the rest of the players. Back of the photo is stamped-

Alex Bremner
PO Box 797
Naples, Florida

Thanks for any and all help

Here is my first try at the players-

Front Row-
1 Roman Mejias (minors 53-75) (majors 55, 57)
2
3 Bob Skinner
4 Roberto Clemente

Back Row-
1
2 Chully Naranjo (minors 55-58) (majors 56)
3
4 Lino Donoso (minors 54-57) (majors 56)
5 Laurin Pepper (majors 54-57) or Gair Allie (minors 52-56) (majors 54) ???