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Thanks, I think I'll go with the US made HBC rotors and hubs.  In LA now and will drive up to Shelby Township MI and have a look at them. Good excuse to drive across the USA.

I remember hearing or reading somewhere something about the quality of the cast iron, nodular, ductile, gray, etc. in regard some of the reproductions. My rotors are worn past spec. and would rather keep the car as original as possible and just replace the rotors only, but doesn't seem like anybody does the rotors only, so want to keep my 2 piece rotor and hubs and and put on the best quality reproduction 2 piece rotor and hubs that are available.
Cheers!

Thanks for your help - the number on the inside face of my rotors are 3910881, can't see any numbers on the hub but I haven't unbolted the hub from the rotor to see if there is any numbers on the back face of the hub.
Everything I can find refers to part number 3901098, but can't seem to find anything on or about 3910881, unless that is the part# for the rotor only and 3901098 is for the complete hub and rotor assembly as per your '69 P&A Catalog indicates.
Just want to make sure if I purchase USA made aftermarket hub and rotor assemblies, they will work with 4 piston calipers with no issues, don't want to put on imported one piece replacements.
Can any one recommend who sells the best quality aftermarket USA replacements.

can anyone tell me what is difference is between 3910881 and 3901098 rotors and which is correct for 68 Z28??