Welcome! The stocks you seek are service style, checkered walnut with a brass medallion (1910-1920 decade). They are available but will run $200-300 for a really nice set.
With that serial # the correct Service grips look like this with Gold plating over brass recessed medallions:
About 90,000 produced so not too hard to find and if the condition you need to match the gun's wear is not perfect, it will be reflected in a lower price.