Oliver 66 with sprockets on axle what are they?

I saw a photo of an Oliver 66 with sprockets on axle what are they for? are they removable? were the sprockets available on other fleetlines like 77 and 88?
 
Whatever comes out of it,I'm looking for a pair! I've got Dad's old planter here,but we let the sprockets go with his old 66.

Email's open.
 

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