The exhaust comes with Exhaust gaskets & 4 Stainless steel Bolts
You can use your existing brackets Exhaust brackets 126we supply the brackets in the link below.
https://www.ebay.co.uk/itm/264654946231?hash=item3d9ea9ffb7:g:ukoAAOSwMDZjF3EN
Fits
CLASSIC FIAT 500
Fiat 126 air cooled