So "We might be making progress there!" simply meant that the answer to the puzzle is a car made by a company named **** Kraft.
Let's try another tack and try to sort out the date. Were the two cars made after World War 2?
Yes, you got one of the names right (Kraft) so I thought that was progress; was I wrong?!
But it's really not a company called **** Kraft, just that the name 'Kraft' is in the name somewhere.
The cars were post-war, yes.