Define output rectangle when creating PDF from PostScript with GhostScript

I have some old PostScript files and try to convert them to PDF files with GhostScript. Unfortunately the PostScript files use some custom paper size (16" x 20") as following:

featurebegin{
%%BeginFeature: *CustomPageSize

1440 1152 0 0 0
  5 -2 roll exch 5 2 roll
  3 -2 roll exch 3 2 roll
  [ {}
    {90 rotate 0 currentpagedevice /PageSize get 0 get neg translate}
    {180 rotate currentpagedevice /PageSize get 
     dup 0 get neg exch 1 get neg translate}
    {270 rotate currentpagedevice /PageSize get 1 get neg 0 translate}
  ] exch get
  4 dict dup begin 6 1 roll
  /Install exch def
  2 array astore /PageOffset exch def
  2 array astore /PageSize exch def
  /ImagingBBox null def
  end setpagedevice
%%EndFeature
}featurecleanup

The "useful" content of the PostScript files will match on paper size A4, so my resulting PDF file shows the content in the left upper corner and have a big border to the right and at the bottom (Example image of created PDF file).

How can I tell GhsotScript to use a rectangle in the upper left corner with a size matching paper size A4 to avoid this big border coming from the custom paper size?

I tried different approaches with combinations of the parameters -dFitPage, dFIXEDMEDIA, -sPAPERSIZE=a4, -dDEVICEWIDTHPOINTS, -dDEVICEHEIGHTPOINTS but nothing works as expected.

The best result I’ve got is a PDF file using the correct paper size (A4), but the content was used from the lower left corner. So I see just a part of my useful content.

I need no scaling of the content, I just want to define the rectangle that should be used for creating the PDF file. Is this possible with GhostScript?

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