Jeff for the cans I’ve refurbished I’ve use these for the rivets:
https://rover.ebay.com/rover/0/0/0?m...2F310463748209
If you haven’t already got a decent rivet gun it’s worth the investment for stainless rivets as they can be pretty tough on the usual style hand operated ones.
Exhaust bands I’ve drilled myself from bought cut strips- loads of suppliers on eBay.
Don’t forget if using a carbon sleeve to line it with some heat reflecting tape or it’ll burn if it gets a ‘hot spot’ as the sound proofing ages.
https://rover.ebay.com/rover/0/0/0?m...2F303207108234
Finally for wadding I am a big fan of Acousta-fil:
https://rover.ebay.com/rover/0/0/0?m...2F360974388595