What is wrong with your master cylinder... does it just need seals or is it badly worn or rust-pitted?
I see FIAT doesn't offer a seal kit, but if it IS just like a light truck MC, there's only a cup and a seal in each bore, perhaps they could be found on-line in a mineral oil-compatible material?
A quick search turn up a company that's come up in several other threads like this, but I don't know if they sell direct or how their distributors would be to deal with.
http://www.precix.net/pdfs/Brakes_pdf.pdf
Email inquiries to: sales@precix.net
And there's "Cardone", which has a "repair and return" program, typically through local auto parts stores that are dealers for them. Contact them and see if they can rebuild with mineral oil-resistant parts.
Email: tech@cardone.com Or call: 888-280-TECH
As to the Chevy MC, what are the bore sizes in your cylinder?
With the Chevy, one side would be for brakes, and likely have a "back pressure valve", the other side for the clutch wouldn't, but parts could probably be swapped around.
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