So just to sort out the shifter boot as it's gone gooy and sticky from sun damage and oil from hands etc...
The whole thing looks so much nicer and way... more quiet, no more sounding like the glove box is going to fall off. That was actually the left side of the dash pad missing the main mounting bolt in one place.
Unrelated, but I got the floor plate re-plated a while ago, plus as few other small bits for the manual.
All in all, was similar if not less cost to buy this from pick a part, have it panel beated and hole welded up and blended, and replated than what it cost to get one in bad shape used off ebay or market place.
I still had a small air leak in the cooling system, I was dreading the worst, a leaking head gasket but quickly realised that the amount of air getting into the cooling system was only a few mL at most and kinda plateaued at that.
The clue came when I was replacing the coolant overflow res cap with a rares one and saw the air bubbles getting bigger real time in the siphon tube on the cap while it was still submerged in the coolant. I was also having issues with the cap seal leaking as rares, more likely their supplier was cutting the seal too small and it misses the lip on the res.
I cut new ones at work, 38.5 OD, 25mm ID out of 3mm neoprene self adhesive foam. Same specs as the rares one but the right size!
And then more evidence it was the cap. I could also today hear the cap whistling when the engine heat soaked after shutdown.
I managed to find some genuine CPC caps on ebay and bought all 4 that were avaiable. I know the issue is the top seal being the wrong design to work effectively with our radiators. I was right.
New CPC one is the clean one obviously. The seal slips into the neck, sealing inside the ID and the top profiled lip seats over the raised bead, forming a 2nd sealing surface. When I installed the new one, I could feeling the positive fit as the seal popped into the neck. The cap also is firm on the neck and doesn't rock in the direction of the cap "ears".
Now I bleed it as best I could and it seems to suck the hoses in a little when it cools down, indicating it's pulling a vacuum to the overflow and in a few drives the air in the top rad hose hopefully disappears as it did on all my other cars. This might be the first time in probably 15-20 years this car had a cooling system that doesn't have issues.

I'm the director of VSH (Vlad's Spec Holden), because HSV were doing it ass about.