It doesn't need a plate to be able to be registered - rego authorities use whatever is stamped into the body
If it doesn't have holes in the crossmember for a small rectangular plate like your K (which must be a late '70 car), it may have 4 holes in the same area for the larger square plate. If no holes in the crossmember, and it is a K then it's a '69 model and didn't have a plate at all. It may have holes in the firewall in the same area where the plate on your '68 car has its ID plate.
What numbers are stamped on the radiator shroud and/or in the windscreen scuttle gutter?
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did I tell you that I won a
trophy?