Here are photos of a carpet set from a 240z Canadian Jan 1971.
Most date codes in the car are Dec-Jan 70/71.
Yup they are yours George... just found while going through boxes in the garage so I experimented and washed then photographed. I think they are original? You can verify
There is no split in the back deck carpet as the 01/1971 had the plastic storage bins behind the seats.
Philip