Custard
The Siena weekend is a 5 door station wagon and its the same size as the Palio weekend. I think the Siena weekend was called that only in India. The model was released here sometime in 2000. I've checked ebay UK as well as ebay USA but no luck.
Hari
They didnt sell the Siena here but if its engine info your after then let us know what your after, as for example the Bravo one covers the 1.6 16v engine. If its body etc then if its more like a punto you'd be better getting that, if you want one for your car you might be able to get one from FIAT, it'll cost you though.
do a wee search on herefor Bravo Brava and Marea manuals on here, they should cover the 1.6 16v if its the same one used, there available to download, i'd find the link but am just heading out the door.