C3 (reverse, 3rd, 5th) - thickness .066" / 1.67 mm - 56 inner teeth - outer diameter 6.180" / 157 mm - high energy - sunburst grooved
There might be discs of different thicknesses for C3 for 09G (TF60SN), 09K (TF61SN) and 09M (TF62SN) available. It is possible that the transmission manufacturer used different clutch packages in otherwise identical transmissions. This might not be realized until the transmission was opened for repair/overhaul.
For an overview about all available friction discs see our product info "CAT-TF60-Friction Discs"