Firescreen for coal fireplace?

Does any know of a source for firescreens for old coal fireplaces? I’ve looked in antique stores and on line and found nothing.
It’s for a fireplace we converted to woodburning but was originally coal-burning from the 1860’s. The fire box is small, the opening is roughly 18″ w x 28″ h. and is square with a rounded top. Thanks.