In order to fit the hardtop to this model of Midget it is advisable to completely remove the hood and frame assembly.
It has a retractable hardtop, so I'm told, but in Project Gotham Racing 2 the top is always up.
Alternatively there is the option of an electrically powered retractable hardtop.
A pillarless hardtop (the most common kind) is completely open on the sides with the windows down.
The 300 SL was a Coupe only, and the smaller 190 SL Roadster was a soft top convertible with a removable hardtop.