As an update, I have had much time to work on this due to life events, but have learned it appears the same grommets were used on the RT800/900/1000. I have also found Specialized parts on Performance Bike that are similar. The shop I took my bike to, which has converted to a Trek Bike Shop, tried a Trek part but is a bit too large. Also, the Kestrel part has bolt connection to the frame prior to the cable entrance which can be seen in the image above. The Trek part looks like the Ebay/Amazon parts.
Still no answer from Kestrel...