SystemVerilog: Creating an array of classes with different parameters

this topic has a similar question like mine. But they don't figured out any solution.

I have defined a class with subclasses. The subclass contains a vector, which width should be different in the array.

array[0] class with subclasses and vector width 32

array[1] class with subclasses and vector width 64

array[2] class with subclasses and vector width 128

and so on.

The definition of the class is the same, only the size of the vector differs.

Example

Class-definition:

package classes;

    class subsubclass#(int width);
          logic  [width:0]                  data3;      
    endclass

    class subclass#(int width); 
          subsubclass #(width)              data2 = new;
          logic                             auto2;
    endclass 

    class my_class#(int width);
          subclass #(width)                 data1 = new;
          logic                             auto1;      
    endclass

endpackage

Testbench:

my_class#(32) my_array [0:5];

initial begin
        int x;
        for (int x=0; x<6; x++) begin
           my_array[x] = new;       
        end
end

In this situation i am creating an array of classes with same width. How can i change this? I tried various things, but i can't figure out if there is a solution.

for e.g.   
    my_array[0].subclass.subsubclass.data3 
    and 
    my_array[1].subclass.subsubclass.data3

should differ. But how? And yes in need it with an array because of using it later in many for loops.

update#1 @dave_59

simplified Class-definition:

virtual class base;
    pure virtual function logic [511:0] get_data();
    pure virtual function int getwidth();
endclass

 class my_class#(int width) extends base;
    logic                                   auto;
    logic  [width:0]                        data; 
    virtual function logic [511:0] get_data();
              return data;
    endfunction
    virtual function int getwidth(); 
             return width; 
    endfunction
endclass

base  my_array [0:4];

Testbench:

    initial begin
           my_array[0] = my_class#(16)::new;     
           my_array[1] = my_class#(8)::new;     
           my_array[2] = my_class#(64)::new;     
           my_array[3] = my_class#(128)::new;     
           my_array[4] = my_class#(256)::new;
    end

I tried different definitions: test0, test1 and test2. I got an error that "my_array" is an unkown type. Any idea how to fix it? :)

my_array[0] test0; // or
my_array    test1; // or
my_array[0].get_data() test2;

update#2 @dave_59

    package classes;

    class subsubclass#(int width);
       logic  [width-1:0]                  data3 = '1;      
    endclass

    class subclass#(int width); 
       subsubclass #(width)              data2 = new;
       logic                             auto2;
    endclass 

       virtual               class base;
          pure virtual function logic [511:0] get_data();
       pure virtual function int get_width();
    endclass

    class my_class#(int width) extends base;
       logic                 auto;
       subclass#(width)          data1 = new;

       virtual               function logic [511:0] get_data();
          return data1.data2.data3;
       endfunction
       virtual               function int get_width(); 
          return width; 
       endfunction
    endclass

    endpackage : classes

Testbench

       module top;

       import classes::*;
       base  my_array [0:4];

        initial begin
               my_array[0] = my_class#(16)::new;     
               my_array[1] = my_class#(8)::new;     
               my_array[2] = my_class#(64)::new;     
               my_array[3] = my_class#(128)::new;     
               my_array[4] = my_class#(256)::new;
           foreach(my_array[i]) $display("i: %0d, width:%0d, data3:%0h",
                         i, my_array[i].get_width(), my_array[i].get_data());
        end

my_array[0].data1.auto2 = 1;

    endmodule : top

How can i set for example a "1" for auto? I tried

my_array[0].data1.auto2 = 1;

I got this error

near "[": syntax error, unexpected '[', expecting IDENTIFIER or TYPE_IDENTIFIER