If the car has a cassette player I would just use a cassette adapter; something like this: https://www.amazon.com/Sony-CPA-Audio-Cassette-Adapter/dp/B00007EDLW/ref=sr_1_2_sspa?keywords=cassette+adapter&qid=1561134918&s=electronics&sr=1-2-spons&psc=1 (though not necessarily that particular adapter)
I used one of those in my Lincoln with its stock JBL stereo along with an old Discman or iPod and the sound was amazing.
I used one of those in my Lincoln with its stock JBL stereo along with an old Discman or iPod and the sound was amazing.
