Tank topper rivet?

[sconlon68]

Looks like a really large OD pop rivet. Are you using a washer and pop rivet to get a bigger diameter, or will a regular 1/8" pop rivet suffice?

[Chopper]

I remember someone theorizing that the rivet is actually inverted, with the crimped portion being what you can see in the photo below. That said, you can use a normally inserted 1/8" pop rivet with a washer and that should do the job for both Level 1 and 2.

[MikerScout]

An inverted medium 1/8 aluminum rivet with a washer on both sides is near perfect.