Spicer 6452 and 6453 for 5 Ton Truck M54A2 M809 

• M809, M813, M814, M816, M817, M818, M820, M54 and variant 5-Ton Trucks with Spicer 6452 / 6453 Manual 5-Speed Transmission
  

We also sell pressure plate and disk in a kit 

https://secoparts.net/products/5-ton-m813-cummins-m809-m54a2-clutch-set-m800-series-trucks-disc-pressure-plate?_pos=5&_sid=6b53fc826&_ss=r