Factory disc brake rotor question

You will need to thoroughly clean, preferably sand blast the assemblies and then get out your dial calipers and start to measure things. Not always best to rely on someone else for your info. The 2 piece were factory swaged for a reason. Not good to just recommend that it will be ok for someone else not to do it. Like you, this is just my opinion.
There is a reason that the factory changed to a 1 piece rotor just a few years later. Less brake vibration problems and stronger assembly. They are very economical. Also if you are trying to keep it "original" you will need left hand studs on one side which are fairly difficult to find right now.
Question, are you doing a conversion or does your car have disc brakes right now ? If not you will need much more than a set of rotors.
DISC-O-TECH: Stop on a dime