Products › John Deere Knife Bar Conversion Kit 6600 6620 John Deere Knife Bar Conversion Kit 6600 6620 $590.00 Part #6620KKnife Bar Conversion Kit - John Deere 6600, 6620 Add To Cart Added! Part #6620KKnife Bar Conversion Kit - John Deere 6600, 6620 You Might Also Like John Deere 14" Spout EJ603514SP $337.00 John Deere Copperhead Concave Set with Cover Plates STSS Small Rotor $8,340.00 AGCO Bottom Sieve 67" x 50" Massey Ferguson 9690 Challenger 660 $1,795.00 John Deere Feeder House Liner Kit Middle ForeAft HXE83498 LH $626.50 Case IH Copperhead Concave Set with Cover Plates No Disruptors Flagship Series $8,340.00