They should fit no problem. On my old mk 1 Uno 45 3 door, I managed to fit the front electric windows from a 70 S five door. This was a very old 70 S ('A' registered) and it had the window switches in a pod under the radio console. Later electric window Uno's had the switches in the front door armrests.
There were actually two types of lifting mechanisms, and the Uno I took them from had both types, one on each side!
One type has a metal strip bolted to the lifter arm, and the window is simply a push fit into the metal strip. The other type had a plastic plug with two 'ears' sticking out of the lifter arm. There is a hole at the bottom of the door glass, and you simply push the hole over the plastic plug until the 'ears' pop through and hold it in place.
All Uno's have provisions to house the electric motor mechanism, which simply bolts into place of the original manual winders.
Make sure you get all the wiring (it's a seperate loom to the main loom), switches and also the control box, a kind of small ECU. This control box also controls the central locking system. It's located on a ledge under the drivers side of the dashboard, just above the inner wheel arch if I remember rightly. On a mk1 Uno it was at least!
It's a fairly simple swap, though you need to have a wire going directly from the alternator to the control unit so that the windows only work when the ignition is switched on. Check the Haynes manual wiring diagrams for clarity.
So if I could fit the 5 door electric windows into a 3 door, logic dictates you can fit the 3 door electric windows into a 5 door!
I've also heard that the electric motor mechanisms from the Cinquecento and Tipo will also fit, but I have not tried that myself.
] heh
