Just happened to remember that a number of the Japanese trucks
have six lug rims.  The bolt circle *appears* to be about the
same.  Ever try to see if they fit?  The lug nut should be
checked to make sure it seats correctly.  They may not be as
strong as the Chevy variety, though.
Or, as a last-ditch effort, how about having a local machine
shop cut the 16" centers out and fit them to 15" rims?
Elvis Hargrove mentioned that.  You could probably find the
parts, and get the machine work done at a reasonable cost
by shopping around.
-c-
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