I do have a 1965 TM 9-2320-209-10, without the -1, but there are no NSNs in it.
The NSN list is in the 1976 -34P, page viii, change 1
It's not in the list.
The installation of a hardtop, instead of the softtop, does not change the truck's nsn, not even if there was no cab top at all.