What rivets for firewall use?

[High_Flyer]

The question is in the thread title...
I'm installing firwall passtrough for my electrical wiring.
What rivets can I use to attach the hardware on the firewall.
I have some MSP42, would that be OK?

Having asked that, all rivets on the firewall so far from the vans kit are "standard" AN rivets.

I'm a bit lost in all the different sort of rivets out there...

Thanks,

Alain.