I haven't checked with Patek, so any expert on this reference please feel free to chime in, but my pretty natural guess is that *all* 5170 iterations in the four metals have the same case dimensions (hence 39.4mm x10.9mm). Cheers ;-)
there were variations within a reference. Eg the very first few 2499s first series cases were made by Vichet. They had a smaller diameter but more elogated lugs than the larger cases made thereafter by Wenger. Another example is the 570 Calatrava. Standar...
The white dial G looks like the thinnest bezel. My P with blue looks middle, along with the J. And the black dial G looks to have the highest bezel-to-dial size ratio