MassSalt -- all responses to your question are correct; I just want to clarify that you wanted to know if ALL Tek Greek series coils are compatible with a G2/Gold Bug Pro (or DP). The answer is YES, but ONLY IF they are DD coils. There are concentric coils for the Greek series machines that are NOT recommended by First Texas for use with the G2/Gold Bug Pro (as you can read in Dave J.'s post which was reposted above by 88junior). As long as you are buying a DD coil, and as long as it is designed for either a Tek G2, a Gold Bug Pro or Gold Bug DP, or for one of the Tek "Greek series" machines (but NOT a coil designed for the original "Gold Bug," or the followup "Gold Bug 2"), then you are good to go. This includes the 13" Ultimate DD coil for the Omega -- it will work properly on your machine.
Steve