My Giulietta pedals are trying to kill me!
This is a well documented problem.
The metal pedals have been known to be nearly lethal when your feet are wet. For example:
http://www.alfaowner.com/Forum/alfa-giulietta/331190-aluminium-pedals.html
http://www.alfaowner.com/Forum/alfa-giulietta/916922-pedal-rubbers.html
In the second link,
armoore provides a useful link that gives the part number for the clutch and brake covers on the manual versions.
I suspect this number (51860207) is for the left hand drive version of the car.
The number you want to order the correct pedal covers for the UK spec is:
50518908.
They only cost ~£25 from a main dealer, and the are direct replacements for the metal covers above.
The metal covers simply slip over the actual medal arms, where you will find a smooth surface. They peel off with some convincing, you can feel the lip underneath the covers where they grip the pedal.
The rubber ones go on exacly the same way (little fiddly, but took only five minutes) as the metal ones. Note that the pedal rubbers do have correct pedals The pedal cover that has a triangular structure on one side is the brake cover. The flat one without is the clutch.
Job jobbed.
On a last note, I do think there is one for the accelerator too, but I am not sure if this is more involved, or what the part number is. I will update this article if I find it.