That body line looks a lot like a 1960s Mercedes rear quarter panel. The 190 sedans had that line from the wheel in 1964, but I can't find any with wirewheels or a coupe.
We once test drove a '87 Sprint to see if it would make an useable second car. Nah, too cramped, too finicky, reeked of fuel. I loved it, though.
The Sunny Coupe did a lot of what the Sprint offered, but being automatic and non-Italian it lacked that certain... Alfa Romeo Sprint-ness. Luckily these days it has battery issues, so it's at least unreliable.