Hi Ron. Are you sure that GT/V6s assembled from August through November were all CK17ME (Aug '72)prefix.
I have records showing the breakup of assemblies as follows:
August '72, 65 manuals & 4 autos
September '72, 47 manuals and 1 auto
October '72, 15 manuals & 4 autos
November '72, 22 manuals & 6 autos.
I'll do some more checking, but I believe that these would have had CK17ML (Sept, '72), CK17MY (Oct, '72) and CK17MS (Nov, '72) prefix's respectively! Cheers, Terry