The F5, Omega 8000 and the Gold Bug SE / Pro and the G2 all use the same coils (5" DD and 11" DD). A coil for the F75 may work or may not work, there has been some mixed results.
Any of the coils for the F5 (Fisher) and Greek series (Teknetics Omega, Gamma, Delta and Alpha) should work on the G2 / Gold Bug SE / Pro, but in saying that, Dave J. has made it clear in a number of posts that the Gold Bug SE / Pro and G2 was designed to work with DD coils only (5" DD & 11" DD).
The fact that some 8" and 10" coils from other metal detectors (ie Greek series) work on the Gold Bug SE / Pro / Teknetics G2 was a bonus, but Fisher / Teknetics has not released any Press Releases saying that these other coils can be purchased / used on them officially. Until that time, you are limited to the DD (Fisher Gold Bug SE / Pro / Teknetics G2 / Omega 8000) coils unless you want to take the risk of using another coil from the Greek series / F5 detectors, ie, the 8" and 10" coils.
Also, note, the coils for the F5 need to have the screw lock type of plug and not the push in type unless you know how to make an adapter similar to the one below.
(Note: You do this at your own risk I might add).
The adaptor below allows me to use the coils from the Greek series and Gold Bug SE / Pro / G2 on my F5.