[Faolan]

I don't know what I'm talking about either.
There are apparently 2 different sizes 13.8mm and 15.8mm "stud holes", sorry called them bolt holes, for discs.
I thought it might have been "thread size", which are shown on spec sheets as 13,7 and 15.8. but the numbers don't match.
One seller told me the 13.8mm sells the most.
I imagine the "studs" mentioned were where the wheel nuts screw on. the holes on my current discs are closer to 13.8 than 15.8.
Rondeo, says 16mm.
Was really hoping that you, cobrin, might have had the answer as you have done your discs and have the zetec tdci-, like me.