This is a A-1981246C1 Plate, PTO Clutch Drive PN: 1981246C1Main Description As Following : A-1981246C1 Plate, PTO Clutch Drive P.N: 1981246C1 Inside Diameter: 3.762"Outside Diameter: 5.268"Replaces: A66364Teeth: 24Thickness: .077" Replaces: A-A66364 CASE , Crossed From: A59231 CASE-IH , 1712-4445 , , 17124445 , Found in Section & Models : PTO Parts > PTO and Related Parts, Case-IH TRACTOR: 1090, Case-IH TRACTOR: 1170 Associated Items : New Also This is An Aftermarket Product And : Inside Diameter: 3.762" Outside Diameter: 5.268" Replaces: A66364 Teeth: 24 Thickness: .077"