Where is the best place to look for new or used parts .
Depends on what is needed. A lot of parts are able to be sourced at National Chain Automotive and Truck stores... but you need to know what parts are military only and what parts are also used in the civilian world. Also how military are you trying to keep it.
The Duce and Half was built by Kaiser Corp (think Willys Jeep). It features Rockwell 2.5 Ton axles, a spicer T-90 transmission (or later models had an Alison 5 speed automatic) Spicer Transfer case and inner axle locks; power came from either a White, Continental, or Kaiser Hercules 478 Cubic Inch Multi-Fuel engine.
Steering was Borganson (Borg Warner now).
So not knowing what you need Cody, I don’t know where to send you. You might talk to DMRO at Fort Rich to find the closest civilian motor pool.