What the f is this?

[joevg3]

step up bar was replaced and there are these two plastic pieces that came with the flap that connects to the rail. What are these used for?

 

[Sandroad]

They look like plastic rivets that get installed with a special tool?

 

[DallasTide]

Those are plastic rivets.

 

[a200]

It looks like a plastic Olympic rivet.

Aircraft and Vintage camper building supplies - Olympic Shaveable Rivets 5/32

Olympic shavable Brazier head pop rivets (bulb-tite rivet). The head of the Olympic pop rivet looks like a solid buck rivet (after you shave the head with the shaving tool) Olympic pop rivets are popular with Airstream restoration because they give you the finished 'buck rivet' look even when...

airpartsinc.com

 

[joevg3]

Thank you! I’ll just find some nuts and bolts!