Interesting exercise. I suppose I'll have to try to make one, but I'll have to restrict it to new cars or I'll be at it all night.

Rudimentary rear seats:

BMW 6-Series convertible
Jaguar XK and XKR convertibles
Lexus SC430 Coupe Convertible
Mercedes SL Coupe convertible
Mitsubishi Colt CZC
Nissan Micra C+C
Peugeot 207 CC
Porsche 911 convertible
Vauxhall Tigra

Proper rear seats.

Audi A3 convertible
Audi A4 convertible
Audi S4 and RS4 convertibles
Bentley Continental GT convertible
Bentley Azure convertible
BMW 1-Series convertible
BMW 3-Series Coupe Convertible
Chrysler PT Cruiser convertible
Chrysler Sebring convertible
Citroen C3 Pluriel
FIAT 500C
Ford Focus Coupe Convertible
Ford Mustang convertible
Infiniti G37 CC
Jeep Wrangler soft top
Jeep Wrangler Rubicon soft top
Lexus IS250C
Mercedes CLK convertible
MINI R53 and R57
Morgan 4 seat Roadster and 4/4
Peugeot 307 CC / 308 CC
Renault Megane CC
Rolls Royce Phantom DHC
SAAB 9-3 convertible
Suzuki Jimny soft top
Vauxhall Astra Twintop

VW Eos

VW Golf VI convertible
VW Beetle convertible
Volvo C70