Help- how to plug square holes on frame

I just had my GFC topper installed and noticed these square holes for the attachment points into the back of my tundra.

Has anybody found any cool ways to plug this to keep dust and water out of these. Possibly 3-D printing?

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This thread might be helpful :metal:

Thank you so very much. I searched and searched and searched, but I couldn’t find the right terms I guess. I really appreciate your help on this.

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Trim 3 sides of the pressure set lip thingies and bam.


Here are some that I made.

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Thank you !!

I’d suggest using a plug such as these found on Amazon.