273 Commando Spark Plug Wire Options?

I have a "slightly" related question about Commando insulators...what attaches them to the valve cover? I have a set that I want to restore with out damaging the insulators.

Norm
Depends on the year.
'65-'66 used round "grommet" style insulators that snap on around the wire, and then press into the tabs on the valve cover.
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'67 used a "yoke" style insulator that snapped on to the tabs and locked in place by way of a hole between the tabs and a corresponding lock tab on the insulator.
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