We run a 200mm Stilo flywheel and OE Fiat/AP clutch on Emma's Cinq, this came with the 8200k 1368cc 16v engine and gearbox when we bought it. This is 20mm bigger than the normal 180mm one as we found that even an uprated 180mm clutch was no good for turbo power, the torque on her car, some 125lb ft@3200rpm just overwhelmed it, so on a hunch we fitted it and job done.
The AP clutch is better made than other clutch assemblies I have seen on the Fire, but then as it has to haul a near 1200kg Stilo about it has to be good. We also run a 200mm flywheel and clutch on the Sei which is a new flywheel from Fiat & I think a OE Valeo clutch, not quite in same league as AP but still much better than the 180mm ones.
This is what I came across for Fiat clutches from
www.motorsportworld.co.uk some Panda 750's 160mm, other 750's + 1.0L Panda's with FIRE engine Cinq/Sei 899cc 170mm clutch, Panda 1.1, Cinq, Sei, Punto 55/60/75 180mm, Uno Turbo 190mm, Stilo 1.2/1.4 16V 200mm, Punto GT 215mm, there are of course others but no point in listing them all.
I got some further info from
www.shop4parts.co.uk Stilo 1.2 16V clutch kit part no. S4P1014 Listed Price: £118.44 Stilo 1.4 16V S4P2440 Listed Price: £122.98, Punto 1.2 16V S4P201 Listed Price: £120.84 punto 1.2 8V S4P217 Listed Price: £86.50. I know there are no sizes there but as there is a small differance in price between the Punto and Stil clutches they are different parts, maybe slightly uprated in heavier Stilo, that's not fact just an assumption.
Aaron.