[vectorit]

Simple answer, is that no one make them.
You will have to fabricate the head liner yourself.
The fabric headliner sold from some of the vendors looks weird, and takes a lot of work from an experienced upholstery shop guy.

Best results I have seen from past builds are with fabric covered foam board, or using sections of FRP board from the local home builder stores.
(Despite what people may think, the "plastic" or FRP materials do NOT form easy).

I myself went with the FRP route.
It came out ok, and is better than nothing.
Do a little research, and a little experimentation.