EXCAVATOR 312-A EXCAVATOR 6GK 312 SUPPLEMENT FOR TRACK-TYPE EXCAVATOR /770MM APEX SHOE/ 6GK00393-UP (MACHINE) XEBP7263 312-A 6GK (1993) Parts group 312-A: For full view, you need register UNDERCARRIAGE TRACK GP 4I-7356 TRACK GP 4I7356 TRACK GP-770MM (30 IN.) APEX SHOE-2 REQUIREDAn Attachment Information: (For parts list, see above)