I believe the 53 body is the same as 50-52. One of the doors on my 52 is supposed to have come from a 53 (I didn't install it myself), and while it obviously has the wrong interior trim, it does appear to fit ok. A possible way to tell for sure would be to find someone with a Hollander and check the windshield glass.
Do you mind telling why you want to swap the dash? It looks like the job would be anything but easy.
Ray
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