This is a A-C7NN7A684D Shaft, PTO Drive PN: C7NN7A684DMain Description As Following : A-C7NN7A684D Shaft, PTO Drive P.N: C7NN7A684D Dim A (1): 20 SplineDim B (2): 37.500" Long Crossed From: AMC7NN7A684D , Found in Section & Models : Tractor Parts Associated Items : A-E1NNN777AB Also This is An Aftermarket Product And : Dim A (1): 20 Spline Dim B (2): 37.500" Long