KELCH 7J204244 John Deere Gas Cap With Gauge 300 312 314 317 400 2 1/4" X 6 1/2" THIS NEW KELCH GAS CAP WILL FIT THE FOLLOWING JOHN DEERE LAWN TRACDTORS: 300, 312, 314, 317, 400 THESE GAS CAPS OBVIOUSLY DO NOT FIT THE NEWER JOHN DEERE 300 SERIES WITH THE LARGER 3.5" DIAMETER FILLER NECKS THIS GAS CAP IS 2 1/4" DIAMETER BY 6" LONG SOME OF THE 300 SERIES TRACTORS USE THE LONGER 7' VERSION, BE SURE TO MEASURE YOUR TANK DEPTH THESE GAS CAPS CAN END UP 180 DEGREES OFF, DUE TO DIFFERENT JOHN DEERE FILLER NECKS