Covers for bed rail accessory ports?

[GA_Rivian]

I'm wondering if anyone has designed or knows of any low-profile covers that latch onto the accessory ports to help keep them from getting gunked up. I was moving some hay this morning and they fill up with chaff and it's a pain cleaning them out.

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[Gee Bee]

I was debating mfg a silicone plug mold for this application.

I invent and design various aircraft products

I designed these contour plugs to keep dirt and water out of the nose gear casting.

So far my 3500.00 mold and product production has returned over 17k in return.