Mike,
I'm in Cerritos, near Long Beach, but I don't know much about 750's beyond what's in Braden's book..
However, Merkel Weiss runs the Southern California Fiat Club and has several Abarths. He mentioned he used to have a double bubble and may still. I'm sure he won't mind my giving you his number, but I guess I should call you directly rather than putting it on this board.
In fact this Saturday they're having a canyon drive near Sunland, which is in the northern San Fernando valley. They plan to leave his house about 10:30 as I recall and return there for lunch. I plan to go along and am looking forward to seeing his Abarths and Moretti Sportiva.
If you want to go I could fax you the info page from his newletter, which has the directions to his house.
Jim Oddie.