Andy wrote:NC30 and MC21 calipers are different, although outwardly look the same. You cannot use MC18/MC21 calipers with 296mm disks.

You will need to either use NC30 or NF5 calipers.

I beg to differ.

You know me Andy, there is no 'cannot'.

They may be different but they can be used. It just depends on what you're doing.