Where can I find high quality headliner fabric to closely match original?

Hello John,

Thanks for being in touch.

Is it your intention to patch the existing headlining? If so, I think you are going to struggle, apart from finding a scrap one and cutting a piece out of that. 
It might well be better to buy a complete headlining from a scrapped car. 
You can advertise your ‘want’ on a number of on-line breaker link sites, where you list what you want and breakers respond to you directly.
Perhaps you could come back to us and colour in a bit more detail. 
Kind regards,

Gareth.