Not sure how elaborate your kitchen sink is. When I bought my RV, the sink did not come with covers. I looked at the underside of the sink and figured out who manufactured it (Lyon Industries) and the model number of the sink. I then googled the make of the sink and sink covers. I was able to purchase them online.
2013 Itasca Sunstar 26HE
Firestone Airbags, Hellwig front/rear Anti-Sway Bars,
Rear Trac Bar, Safe-T-Plus, and 480 watt solar system.