These are called "Clutch Head Bolts". They were used on the later "letter series" tractors to fasten the grills and sheet metal parts to the tractor, (See parts number 11 and 15 in the illustration below). At least these have a hex shape to them. The earlier ones had a ROUND head and there was really NO way to remove them except with a special driver. And guess what?? You can get the driver from Davenport Tractor!!
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