To change rotor on 97 Hyundai Sonata do I need to remove the castle nut and hub?

[John]

I'm looking at a manual which shows bolts holding the rotor to the hub but I do not see the bolts on the outer side of the rotor. I've looked as best as I can from behind the assembly and can not see these bolts either.

If I do need to remove the hub, do you know what size the castle nut is? I do not have a socket of that size yet.

Thanks!