Fiat Uno (MK1) brake hardware?

Hi all,
I'm working on this sweet 1984 Fiat Uno MK1. (probably the only one in Canada)
It needs rear brake wheel cylinders, and a master cylinder. (I seem to remember
that the parking brake cable broke as well).
I'm wondering if Fiat 850 components are similar (at least the rear wheel cylinders). I'm here in Toronto, and our local supplier (Mario Ricambi Inc. 416-675-4004) has a ton of Fiat 850 and other Fiat parts, less the Uno.
I'm wondering if any of the brake components are interchangable between models (specifically Master cylinder and wheel cylinders, I haven't checked the front calipers yet but I assume these are similar to all earlier versions, but they are fine (no leaks)).
Any info would be greatly appreciated.
Myron Samila
Toronto, ON Canada
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