I just am going through this as well. I couldn't get a confirmed size from a ford dealer(the kept saying 16x12x1.5) so I ordered a stock one(they're like $2). It should be 16x1.5 for size and pitch, with the plug being 12mm long. I ordered this:
https://shop.namelessperformance.com/magnetic-oil-drain-plug/ as they seemed to be the only quality one I could get by this weekend guaranteed. I didn't want the mishi plug or similar with a short hex and no flange behind it.
Looks like there are a few options out there(greddy, project kics, etc) that are similar to the one I picked up. I'll let you know fit and finish when I get it and install it saturday.