The chain plates may not be the issue, it is the bulkhead to which they are attached that is a concern. That whole area and the wood under the port are suspect, but can't tell from the photo, need a larger photo.
Get a sample card of wood stains, find a couple that appear to be a close match. Buy small amounts of the stain and apply it to samples of the wood. Pick the one that has the best match. Look in hidden places, like inside hanging lockers for unfinished wood of the same type as the bulkhead, apply the sample stains to those areas.