Dauphine Gordini restoration

Another question for the brains trust.

During recent lockdowns I've been working on a set of front discs I had spare with the view of swapping out the drums one day.

Do I need to replace the steering knuckle/axle with a specific disc type? Or were they the same for late dauphine/early R8 with discs. Looks like if I test fit the backing plate and rotor on my existing axle the rotor alignment is out which leads me to believe the axle taper is different on disc models. Or I may be missing something?
 
The early R8 stub axle assemblies have the same stub axle etc etc as 4CV/Dauphine. The calliper brackets bolt on exactly to the Dauphine stub axle assemblies instead of the drum backing plates AFAIK.

The later R10 stub axles are longer. So if you have the R10 hubs the bearing spacing is a few mm too large for your Dauphine stub axles. The solutions are (a) find some R8 ones and (b) machine the hubs to get the bearings in the correct position. Both have been done successfully as you'd probably know.
 
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