OldIHC

This may be easy but how can I search for the truck model "K-4"? If I put K4 it is too short. If I put K-4 it says it can't find that. I believe the "-" character is confusing it.

I do not think we really have any information on the site, and perhaps one other member who has one.

As was stated, there were very few made, here is the page on the Wisconsin historical society page with the serial(chassis) numbers the 1940-1947 tab: http://content.wisconsinhistory.org/cdm ... 529/rec/15
I think that your best bet for similar parts will be the K5 model. A MT-52D Parts catalog is the one you should find part numbers for your vehicle, then your search begins.
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Lloyd Bledsoe