Boat railing end caps

[jayzad]

My boat has rails that run from the back stern of the boat, up each side, and to the front point of the bow. I can't find locally, or on the internet the rail end caps that are now missing from my boat. The rail end caps are shaped like a ice cream cone, with the cone part inserted into the rail. The end caps are right in front of the navigation light on the bow of the boat. Picture is attached.
Thanks for any help.