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I haven't had to buy any Cat parts (hope I won't have to for awhile!) but I wouldn't expect it to be any different from buying parts from a John Deere or Chrysler dealer. IIRC I used their online parts catalog to look up engine filters for price comparisons (hint: 3rd party sellers were less...
I'd say the LMTV from the mid 1990s would be an alternative from what I've read. I don't believe those trucks have electronic diesels, but the Cat 3116 like the M35A3. I think they all have electronic transmissions though.
If I got a 5-ton I'd want an M939 truck, with the M809 or M39A1 coming...