PS Types on '68 SLT-6

Quick question....my buddies say 2 types of power steering units were available in 1968 for my 1968 Dodge Dart SL-6. One was Saginaw, what was the other type/manufacturer? I don't have a Saginaw. Is it Kesley-Hayes? Filler caps are the same they say but hardware (brackets) are different and hoses must be from exact manufacturer. Question is asked more for curiosity. Thx....Darts forever!!!!!