First thing first. i would like to say welcome to the club.
So i had a fitment problem with the mfg of this brake kit. I have the 4 piston kit purchased from Axle gerstl
4 piston style
Brake disc tuning kit front, for 2 sides, PREMIUM Fiat 500
webshop.fiat500126.com
Yours is this kit, obviously you bought from a different source, but the same mfg made it, wherever that could be lol
Single piston style.
Brake disc tuning kit front, for 2 sides, PREMIUM Fiat 500
webshop.fiat500126.com
I wasn't able to hunt down who was the original mfg, and there is a design flaw in the way it mounts. and causes rubbing of the caliper on the disk. If you read my build thread, i discuss it, and show how to remedy it. Obviously i was super disappointed in the fact that something of this price needed "fitting" and modifications. However, once sorted out, its a really nice kit. Probably one of the nicer kits in term of overall design and material quality (minus the fact that it needs modification to fit, which IMO is not acceptable). But i had no choice but to "modify", but luckily had the tools and knowhow.
PAD INFO:
so, hoping that the pads are the same as mine, which i think they are. The pads originally belong on a classic 80's Benz rear pads. i will go thru my stuff to see if i can find a part number for you to reference. I myself drive a 80's benz and noticed the pads a mile away. I even ordered some EBC Red pads for the fiat if i wanted even more braking performance. Basically reference rear pads for a 86-91 W126(560sel....). or the list on the box below. You should also be able to get the anti rattle clips for the car. The pad hole spacing should be the same, caliper opening might be different but could be close.
Sadly the calipers are custom to this 500 upgrade, and are not an off the shelf product. In regards to the front brakes. I just saw now in your photos you also got rear disks conversion. sadly i havent done any research on them