Interior roof material

[KIC]

I just posted this in my thread, but hoping somebody can point me in the right direction.

I am working on the interior of my 60 GMC Burb. Trying to keep it as close to original as possible without breaking the bank.

Going to order the new firewall insulation pad, looking at what is available for the original style rubber front floor padding and now the ceiling.

I am trying to keep this as close to original as possible. I have not seen or heard of anybody being successful on finding the similar silverish roofing that came with it.

With trying to stay somewhat original looking, what has anybody come up with to install between the ribs ?

Any pictures, leads on material will be appreciated.