Sill trim replacement

Hi there. If I am looking at your piece, to me, it appears to look like a snap-in glazing bead. This is something we do happen to offer. In order for us to help, we'd like for you to send us a couple of more photos showing the part from an end profile so that we can see its full shape. This sample must be in pristine condition with no damage to it; otherwise we can't be accurate with our recommendation. 

Thank you for the extra photos. I believe our best match is our 55-062 snap-in glazing bead. Take a look. Our top doesn't stick out as far as yours does, but this may still work. Look it over and let us know what you think.