Another part that seems difficult to find is the rubber cover that goes over the front suspension strut and prevents dirt and grit getting into the top mount and ruining the bearing. As it is impossible to get hold of left hand strut mounts it seems like a small price to pay to ensure the ones you have last as long as possible.
These are now injection moulded.
Part number 11 in the exploded view
These also fit Alfa 33 (1990-1994) models
Price is for a single cover