Davit dummy plugs

Formulaben

Wondering if anyone knows of a "dummy plug" that would fit into the Davit slots in my swim platform?  Somewhere I saw that someone made fiberglass plugs directly on the deck with mold release.  They looked factory but a lot of work to make them look perfect.  I'd rather just buy some plugs and install them, as I see no davit in my future and would like to put SeaDek on the platform and have a smooth full-length edge without those emply slots. 

Ideas anyone?

EDIT: I'll answer my own question...I found one example here but also saw one elsewhere and can't recall where.  I guess I can use HDPE and make my own.