source for pebble-grain board?

["Mark Gendron" <mister_toad@email.msn.com>]

I'd like to find some pebble grain pressboard like that which TRF supplies
as a front petrol tank cover for the early TR3. It's about 3/32" thick, and
feels like something in between cardboard and masonite. The finished surface
is black with a pebble grain pattern. Is this a common type of material that
might be available somewhere in sheets, or is it only manufactured to order
in specific configurations?

Thanks
-mg