Muffler Heat Shield Hanging

So a couple of days ago I decided to check my CX5 KE all around and found out that the Muffler Heat Shield was literally crying for help (above the Silencer Main), I was surprised I found out by accident and not because of a rattle noise, because out of the five of this bolts looking rivets things that's supposed to have, only one was holding it 😆 (Lots of salt on winter season corrodes everything where I live).
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Anyways, I ended up using some regular high temp bolts in there... I'd like to know what type of SCREWS, BOLTS or RIVETS are these things that were holding the shield plate called!?? I've been typing every word that comes to my mind and NOTHING... any ideas!? 🤔
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