G'day Keith! My database showed a number of Holden-assembled CMPs with PE- etc contracts.
However, you must be right in the sense that the plate shows that it was not a CKD job (which carried a Holden sequential number) and usually a plant code. I stand corrected and suggest that it was a SUP import to Australian order, and not assembled per se. The serial number is in the Oshawa sequence, and lack a plant code as well.
Thanks for pointing out the wrong choice of words.