The PS-8500-07 is a perfect upgrade or replacement set of saddles for your 7 string Gibson Nashville bridge dated before 2000.
6 string version pictured below.
String Saver Original saddles are made with a unique combination of materials made to enhance tone and dramatically reduce string breakage. Each saddle is impregnated with PTFE, the slipperiest substance on earth. The PTFE in String Savers eases the grip between the saddle and string, spreading the stress over a greater portion of the string, just enough to drastically reduce string breakage.