Given the fact that the original Schofield was never supplied with them - the Army Contract specifying Walnut - I doubt that any manufacturers of replacement grips make them - not having an original example to go from.
They reproduce those grips needed for replacement/restoration.
Those who make the various 'man-made' Ivory types 'do' have examples to go by - as there are numerous original guns that feature carved, checkered and smooth Ivory grips.
Scouts Out!