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antp
The English Wikipedia page has "CD539". If you click on the CD4 Platform page, all four are listed. And then this page, about halfway down, goes into more detail:
My bad, indeed it was CD539 only on Wikipedia.
The suffix is maybe worth keeping in some special cases indeed (though that we have the made-for tag), we can use CD539 by default for others.
The only two who didn't had a N were these:
https://www.imcdb.org/vehicle_1922231-Ford-Edge-CD539-2015.html
https://www.imcdb.org/vehicle_1867860-Ford-Edge-CD539-2019.html
both from US location.