Gidday Walter, good to see another Pontiac surface in New Zealand. Check out my auction for boot channel on Trademe 1756508917. Got this made to use on my 60, may fit your 68. Gayne.
I hear ya, I'm looking for the badge/emblem that used to be on the vinyl behind the passenger side rear window. The car had some bodywork done decades ago, and it wasn't put back on. Took years before we noticed it was missing. If anyone has one of these, I'd love to buy it from you! (I have a 4-door 1968 Grande Parisienne)