What goes here?

Knocked one of the covers off during last snowfall. Looks like something could screw in but don’t think the cover had any screws. This is on the roof of a Mazda2.

IMG_0416.webp
 
The part you are looking for is this molding cap. You are correct, it does not screw in, it slides into place. It covers/protects the mounting point for securing the foot of a roof rack to the roof.
 
I was thinking it may accommodate a roof rack. After a quick search I didn’t find one compatible with the Mazda2 but didn’t look very long admittedly. Ty! If I leave it open will it get water damaged, ie should I replace the cap?
 
It is indeed for the roof rack attachments.

I removed my continuous roof gully rails when I bought the car for a set of these as I had a roof rack. I wouldn't worry about water ingress/rusting though, as both are designed to let water run underneath. If you have a 3d printer you can printhem off, or pop along to a mazda dealer and buy them. Not expensive
 

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