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I believe that 5x7 was the stock size for most 944's, however any 1987+ IIRC can accomodate 6x9. Earlier years require cutting into the body panels to make them fit.
It would take some major modification to fit 6X9 in a cab(I looked into it for my recent stereo upgrade). Must be a cab specific difference. Cab production started in 1989.
I don't want to derail your thread so I will bow out now. I wish you good luck in your search for the panels.