67 68 brake rotor casting numbers

[Rsconv68]

Specifically asking about the 2 piece brake rotor “hat”, I’ve searched and have not found any threads with pictures of the casting numbers on the inside/underside. I’ve read a few posts but sometimes the cast and part number do not align. I’ve got one cooking in the electrolysis vat and am hoping to identify as correct/original. Any help with both sets of numbers and pictures is very much appreciated, or a link.
Thanks in advance