Insulator/anti drum material?

[NickF]

The foam? between the bar and the door skin has broken down now there is a void between the two 

Also the foam that sits on the bracket on the air tube 

Whats best to use 

[C.A.R.]

Buy some suitable width and thickness adhesive closed cell foam from your local hardware store.

[AndBir]

1 hour ago, NickF said:

The foam? between the bar and the door skin has broken down now there is a void between the two

I suspect you will need to clean out any remaining "foam" (probably using a hacksaw blade or similar) and then try and compress and slide in some new closed cell foam (as CAF mentioned).

If the gap is too small to use foam then you could experiment using some "moisture curing, polyurethane glue" - clean and dampen the surfaces and then squeeze on the glue, it expands as it cures so can fill small gaps.

Another option maybe getting a strip of mass loaded vinyl to insert into the gap.

(photo from an early 260z door - shows original "foam")

[gilltech]

What about one of those gap-filling expanding spray foam products that plumbers use to seal around pipes.

[NickF]

Thanks I guess some type of dense foam will be the way to go?, the bar is screwed on at one end and welded the other.

have unscrewed but it seems not to want to move should I force it then compress foam or will I distort the bar?