Sierra 23-4004 Alternator Belt For WesterbekeSierra replacement alternator belt for Westerbeke generators.Interchangeable with: Westerbeke; 30475; Application:Westerbeke 10.0 BTD(60HZ)/7.5 BTD(50HZ); 12.5 BTD(60HZ)/9.4 BTD(50HZ); 12.5 BTDA(60HZ)/9.4 BTDA(50HZ); 12.5 BTG(60HZ)/10.0 BTG(50HZ); 12.5 WMD(60HZ)/9.4 WMD(50HZ); 15.0 BTD(60HZ)/12.0 BTD(50HZ); 15.0 BTG/A(60HZ)/12.0 BTG/A(50HZ); 8.0 BTD(60HZ)/6.0 BTD(50HZ);