Pop rivet size?

[Mollysdad]

I want to remove one of the fittings that anchor the rock guards. The one's that hold the Dzus fastener for the side windows. One of mine has never worked, so I'm replacing the 1/4 turn with a machine screw.
The only relevant part is what size pop rivet holds the fitting to the window frame? I'd like to be prepared.

Thanks in advance.

[CRH]

I believe those are 1/8". I would buy an assortment pack of aluminum rivets from the hardware store. I would put some sealant on the rivet before installing it and then a dab more on the spot in the center where the mandrel snaps off.

[Mollysdad]

By changing the search terms I found an old post saying they're
1/8" x 1/4" CLOSED END pop rivets. Couldn't find them in an assorted pack, so I ordered a hundred. ($15)
Perhaps the closed end are more leak resistant.
Coming tomorrow.
I bought the trailer new, never opened the front, but finally saw the Dzus fastener that refuses to latch. Not me, maybe the dealer or it never worked.
To my thinking, the machine screw is a much better solution anyway.

[richard5933]

Probably a good idea to have a small supply of 5/32 rivets on hand as well - they're very handy for times the hole from an 1/8 rivet has gotten wallowed out a bit.

[Mollysdad]

Well, it's progress.
Step 1, drill out the existing rivets using a #30 bit. No problem.
Once you have it in your hand it feels much smaller than I imagined.
Step 2, here's where the options fall. I realized that without some sort of 'gripper' there was no way to keep the new screw from just spinning. My solution was to take a washer, Dremel off the sides so it was sort of square and forced it in the cavity using the screw and nut. Then I applied a liberal amount of RED locktite.
Step 3, re-attach using 1/8" x 1/4" closed end pop rivets, covered with a gray RTV. (photo)
Step 4, clean up.
The fasteners are 10-24 x 3/4" stainless truss head screws. Truss head screws have a larger flatter head profile. On the outside is a washer, then a regular #10 nut, the window bracket and a #10 nylock nut.
Sorry for the lousy picture, hopefully, it shows the concept.
It was common sense enough I'm going to replace the other three Dzus contraptions, but I'm going to try a star washer as my 'anchor' inside the cavity.
Thanks for the wealth of good advice from the pioneers, I took it all, used what seemed right for me. The system, mostly, is that proposed by Air Miles.