Who was making ignition insulator on valve cover

4spdragtop said
I would say if your car has one of each type, then the valve covers arent a matched set. I don't believe either type.of insulator will fit on either type of valve cover. Insulators are VC specific

These are all factory, no way my dad would have changed anything.

It had the original top in the car when I got it!

The single round insulators fit into the round openings of the rectangular tabs on the valve covers