How can I implement code that parameterize or even instantiate what an actual C# Type variable actually refers to? [duplicate]

Let's just say that some other code in some other file already does the following:

SomeVehicleType = typeof(Car);

which is located in some other file.

Now, using the Type SomeVehicleType in the current code file that I'm implementing, I have the following code:

public int SomeBlahMethod(Type SomeVehicleType)
{
    dynamic actualSomeVehicleTypeInstance = Activator.CreateInstance(SomeVehicleType);
    List<actualSomeVehicleTypeInstance.GetType()>  blahVehicleList = new  List<actualSomeVehicleTypeInstance.GetType()>();

    // Or even the following line of code

    List<typeof(actualSomeVehicleTypeInstance)>  blahVehicleListSecond = new List<typeof(actualSomeVehicleTypeInstance)>();         
}

Both the aforementioned lines throw a bunch of syntax errors

Basically, how can I implement code that parameterize or even instantiate what an actual C# Type variable actually refers to?