the B5/B50 is the recommended one, but the B7/B70 can be used on thin acoustic/electric guitars. the SG isnt acoustic/electric, but it is thin, so i guess it could work. try looking around on google to see if anyone has done it before. i know there was a signature flying v that had one of the long bigsbys (similar to the B7) on it, it was pretty cool. so i dont see why it cant be done. just make sure you mount it straight and in the right position.