Does anyone know where I can get either Tecmo Super Bowl or Tecmo Bowl: Kickoff Sprite Sheets?

Why I am asking this is because I wanna create a Tecmo Bowl CPU game for the Game Maker, in which it will be called: 'Tecmo Bowl: Rushdown.'

I think if you ask the company they might give them to you, or you could just buy them(the games) on Ebay.