[vespaholic]

@Pyrotechnic:
Thanks, I'm all about original.
I can appreciate mods others do, but it's just not for me.

I did a little more work on the headliner this afternoon.
First Picture Below:
I brushed off what I think is the remains of the foam and glue from the fiberboard with a coarse rag.
Second Picture Below: (Back of original vinyl headliner.)
I then removed the same remains from the vinyl by using a steamer.
Both came off very easily.
I now feel the surfaces are clean enough to re-glue.
My buddy suggested using brush on contact cement and doing it in sections rather than all at once.
I'm going to give that a shot unless I figure out something better to use.