IND USA DISTRIBUTING JOHN DEERE GLOW PLUGS YOU ARE BUYING A SET OF FOUR(4) GLOW PLUGS THAT REPLACE JOHN DEERE P/N AT16499 AND P/N AT23537 FOR DIESEL TRACTORS AND CRAWLERS. APPLICATION: 1010 SER. 31000 AND ABOVE AND 2010 SER. 29000 AND ABOVE PLEASE NOTE: THIS PLUGS REQUIRES A 3/8"...