Rotors

MoparLeo said

You know what, you might get lucky. There were 3 different disc brake systems used in 68. Bendix, Budd, and Kelsey-Hayes. Flip the assembly over and check to see if your rotors are just bolted from the rear. If so the studs will be ok. Show us a picture.
The actual procedures are in your Factory Service Manual in the Brake section.
If you don't have one, free downloads are available.

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Well, going by the pic in his first post, they're KH... Bendix and Budd were B and C body, and I'm assuming he's got an A body- but you know what they say about assuming.
A body had KH (sbp) up to '72, and unicast (lbp) rotors thereafter.