Drive plate 327 mm. Technical specification: - 327 mm- ceramic- 5 pucks- sprung center- 10 splines- spline hub outer Ø 1" 1/4More information about compatibility:- JD tractor models 2040S and 2140 from engine serial number 416040L onwards, with 5 pucks, ceramic- not for other JD models with SG2 cab