Welcome Justa! You can use any automotive type unit and you might be able to find Hondaline speakers on e-bay like the ones from your year wing"s Type I-III audio system. I would go with a marine grade unit for the head though as they are more durable and weather resistant. There are also lots of marine grade packages available at stereo shops and on e-bay. They have players/radio units with speakers and amps. I put one on my St and it worked great.