Where do I find this trim?

[Mike26]

I have trim in my shower window. It was replaced at one point with this beige piece that cracked. I'm looking to replace all of the trim as this should be a lot easier than trying to find the same trim pictured here. The trim used sits against the window sill to prevent water from getting under it. Can someone point me to this type of product online as I've been unable to find this at the hardware stores and all my searches only find me wall trim pieces.

 

[Mike26]

I pulled off the beige piece to get a few more images. Perhaps this will help identify the product.