We don't have them in your exact size but you can cut these down to your size.
This is for interior stair remodeling only. Not exterior.
This product is for when you remove carpet and add hardwood treads to your stairs. After this is installed you can drill your holes and glue your balusters in as normal.
I don't fully understand your question, but it is shipped with the top tread and top trim already attached as one piece. The riser is separate. You should be able to cut it just fine as most people trim them up some before installation.