Which Saudi F-15 units are the OCUs?

Simple question, and probably difficult to answer! 55 for the F-15S, but which for the F-15C?

RSAF 2 Wing, King Fahd Air Base, Taif
5 Squadron, McDonnell Douglas F-15C/F-15D Air Defence Fighter
34 Squadron, McDonnell Douglas F-15C/F-15D Air Defence Fighter

RSAF 3 Wing, King Abdul Aziz Air Base, Dhahran
13 Squadron McDonnell Douglas F-15C/F-15D Air Defence Fighter
92 Squadron McDonnell Douglas F-15S Strike Interdiction/Attack

RSAF 5 Wing, King Khalid Air Base, Khamis Mushayt
6 Squadron, McDonnell Douglas F-15S Strike Interdiction/Attack
55 Squadron McDonnell Douglas F-15S Strike Operational Conversion