Applicationt: 
CATERPILLAR G3500 Series, G3600 Series CUMMINS Q19G, QSV GUASCOR FG180, FGLD180, FG240, FGLD240, FGLD360, FGLD480 JENBACHER 208 612 12-Cyl. After 9 (95, J616 16-Cyl. After 9)
Production Description:
LIBEN Type LB13-1A
Thread M18x1.5
Reach 20.6 mm
Hex 22.2 mm
Seat Type Flat
Gap 0.3 mm
HeatRange77
Electrode Type Massive Double Iridium J 'Gap'
Resistor
Notes:
Champion RB77WPCC / BOSCH 7301 BOSCH 7306 / DENSO GI3-1A, GI3-3A GI3-5A /BERU 18GZ6-77-2/ALTRONIC L1863IP
Application: Most common in Jenbacher engines
CATERPILLAR G3500 Series, G3600 Series
CUMMINS Q19G, QSV
GUASCOR FG180, FGLD180, FG240, FGLD240, FGLD360, FGLD480
JENBACHER 208 612 12-Cyl. After 9/95, J616 16-Cyl. After 9/95
PERKINS 4000 Series
SUPERIOR 1706G2, 1712G1
WARTSILA Model W25SG, W28SG, W34SG,
WAUKESHA 9390GL (13/16 Rch Hds), 5115GL, 5108GL (13/16 Rch Hds), 5790GL (13/16 Rch Hds), 7042GL (13/16 Rch Hds), 2895GL (13/16 Rch Hds), 3521GL (13/16 Rch Hds), 12V-AT25GL/AT27GL (13/16 Rch Hds), 8L-AT25GL/AT27GL (13/16 Rch Hds), P48GL/GLD, L36GL/GLD, H24G, H24GL/GLD, F18G, F18GL/GLD