Hi,

thanks for the hint.
Yes, I took some measures....

The interesting thing is, that it seems that most likely non-Cossworts hub may fit, but I did found only for solid disc. It seems to be different because the vented is 20mm and the solid 10mm thick. Also the size of 253mm seems not to fit to this set-up in a standard Sierra.

Could it be a mix of different female hub, carrier and disc? (not sure about the correct wording, how do you name pos 1 and 2 in the above picture?)