Check out this link then to see if you can make a cable. Its not hard.

https://www.rx7club.com/1st-gen-archive-71/audio-building-stereo-line-port-s1-s2-stock-clarion-675720/

 

i actually just looked at that before you posted, but the connector on the back of my radio doesnt look like that one. its got a black, blue, yellow, green and then copper coming out if it for a ground. and the pins arend layed out like that either. ill try to get a pic.

 

did you ever get your cassette player fixed by 1983 RX seven cassette player no longer works and I am thinking it’s the belt but wasn’t sure how to fix it.

 

that user's last activity on the forum was in 2017. doubtful he's still around.