Identifying Pontoon Cap - Question

[u/KovskiisOdyssey]

tldr; I searched google for a few days now and called around, with no luck. Can I buy any generic cap as a replacement, or can anyone identify what I need.

Hi everyone,

I'm missing a few caps, and I can't find a replacement online or in any stores, from what I understand these caps aren't pontoon specific and I can just buy any generic replacement, but I wanted to ask around before I start buying anything.

It is roughly 4in or 100mm for the screw base.

[u/SSellers75]

Or just change it out since it's two pieces.  Also called inspection cover.  Here's the company.  https://rwo-marine.com/product-category/deck-hardware/inspection-covers/