I don't remember a black interior in a Sandman that didn't have a black headliner back when they were new, not to say you couldn't order something else, but who would have?
There may have been some come down the line with optional colours, possibly because that was just what was available at the time the van was being built.
In my opinion, if you are fitting a black interior then a black headliner is a must, regardless of what it might have come with.