1 Piece Aftermarket Front Rotor For A 71 Charger ?

Do they make an aftermarket 1 piece front rotor for a 71 Charger,B body,etc.? I think I saw them on RockAuto.com and was curious,.....they were cheaper as well. I think I saw 3 different ones,1 piece,rotor only and rotor w/hub.

http://www.rockauto.com/catalog/moreinfo.php?pk=1279406