Hi Rob, as William said i doubt anyone will cut you wooden blanks as thin as 2mm or 3mm, as long as you can get a blank to the size of 160mm X 50mm X 5mm you can then cover one side with a piece of masking tape, then find a perfectly flat board now stick the masking tape side piece of wood with double sided tape to the board and hand sand with a sanding block, remove masking when you have the required finish, now repeat the other side. takes a fair bit of elbow grease but it's easily done.
Jamie.