If you want to play MP3 files on the unit (as you asked in the sticky) you might want to try this:
https://www.aliexpress.com/item/32791620758.html
Tune in on the frequency of the device and you can enjoy MP3 files with reasonable quality. I have been using it for a short time in one of my cars and was not disappointed.
All you need is a cigarette lighter in the cubby box and you'll be set
You can probably get these on FleeBay as well.