I think it's for a 156 anyway. The swivel is at the top. It might fit other models I am not sure.
Bought it for my GTV at Spring Alfa Day from the parts people that were there only to find when I came to fit it that it was not the right one for a GTV.
It will be going to the next Rivington meet with me and for the price of a sausage barm and a cup of coffee it's available to whoever shouts first.