Part Number: C5NN7N109A. Part Type: C5NN7N109A NEW Counter Shaft for Ford Tractor 500, 600, 700, 800, 900, 501, 601+. Replaces: C5NN7N109A, NDA7111C. This tractor part replacesC5NN7N109A, NDA7111C. Fits Tractor Models.