When you find the cowl vent parts make sure they fit your model 740, the cowl vents and levers are different between the closed and open cars, at least that is the case with the 1929 models and very likely the 7th Series.

The head studs may not have been screwed far enough into the block and they were "Bottoming out" in the acorn head nuts. It's very I'm important to check that the acorn nuts are tightening onto the head and not the top of the studs

Joron,
That's quite a project. Good luck with it. I know of a pair of 633 Sedan doors that I believe are the same as the 626 but they are in Australia. Shipping costs to Norway would be very expensive. However, I can check them out if you are interested.
Attached is the Packard Body dimension sheet for the 626 convertible coupe.
David

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Karl,
The reproduction vacuum tank tops have been available from this business here in Australia for many years however I believe it has ceased manufacturing. It may still be selling old stock.
https://vintageandclassicreproductions.com/product/stewart-vacuum-tank-top-63/

I guess the only way to test your tank is to see if it works, there will be many original tank tops still working fine, pot metal is strange stuff it doesn't always crack and expand.
David

Karl,
If yours has a pot metal top you will find very small brass seats have been cast into the pot metal under two valves that are connected to the rocker that is operated by the float. In my case the pot metal had expanded a little loosening the seats and preventing them from sealing, If you have an aluminum or brass top it will not have those brass inserts
David

I haven't been able to find the earlier thread on this subject but as I recall, it was clear that they were black when they left that factory. However dark red to match the car would look fine unless you are obsessive about the authenticity of such a minor item.

This question came up some time ago, It was determined that they should be black,

The puller screws onto the hubcap thread with a pinch bolt to clamp it tight and jt has a large centre bolt pressing on the end of the axle. The hubs can be very tight on the axle taper.

I had the same problem with those brass seats coming loose. I replaced the top with a reproduction new one.

The horn button surround on my 633 could be removed by pushing it down and turning it anticlockwise, I expect the 526 would be the same.