This photo and caption out of the February 11, 1946, issue of the Herald-Journal (Logan, Utah), shows the press photo that was for sale on eBay back in 2013.
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Originally Published September 18, 2013: According to the attached information, these jeeps were winterized with left over Japanese transport plane materials.
This 1946 photo was also available in 2013. It too was taken at a Japanese airbase, but it’s unclear to me if it is the Showa airbase or not.
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This press photo was taken in 1946 in Showa as well.
“This is an original press photo. Instead of manufacturing cargo planes for Japanese use, this assembly line is making US Jeeps fit for winter use. Japanese stocks of aluminum, plexiglass, rivets, iron rods and fabric are being fitted to jeep use. Photo measures 9.25 x 7 inches. Photo is dated 2-6-1946.”
Pics from a previous eBay auction August 23, 2017: