Two-sided foam tape works but I actually prefer the rope seal caulk stuff.  One bead near the outer edge and one near the inner edge.  
That stainless will scream like the devil going down the highway if not sealed up tight!

Yes
It is soft and stays that way.  I just used some today on my 69 rear license  plate light. The original foam gasket had dried up.

Also used some on the center stoplight fixture on the cab roof. Those trucks are bad about burning out  the stoplight bulb and the bed light bulbs. Water running off the roof gets past the factory seal and kills the bulbs. Sealed across the top leading edge with rope caulk and bulbs last forever.

I have a new gas tank to install on my 69.  Will use two rows of rope caulk seal around the perimeter. Works great!

True74yamaha wrote:

Are you asking for to hold on the upper door weather strip retaining trim? It seamed like was a urethane but like the stuff in later wind Shields. Or Butyl Sealant Roof tape in black. But no one would know the difference if you used gray home depot sells rolls of it in building materials.

 
Yes the piece that sits against the metal of the roof.  I bought the gray rope seal but it appears I had bought some black rope seal as well. The gray is in a big roll and the black is only like 10” strips in a box.

I do like the idea of using the gray to get a solid seal.

Between this trim on the metal mounting surface on part the roof. Picture is not of a car I own.

Butyl tape or roof sealant tape it should be black to be correct. I had to clean alot of those up in the car shop everyone had black butyl tape or black roof Sealand.

Nos681 wrote:

This is what I used for gas tank and rear glass seal.

There are generic versions of this available now.
This was available locally, so this is what I used.
It is the same material as the windshield sealant rolls…just smaller.

Put a little WD-40 on your fingers to keep from sticking to you.
Works great for clean up of traces of this sticky mess.
Have a lint free rag available too…you’ll need it.

 
That’s the same black stuff I have.