Reddit reviews XINGDONGCHI USB Bluetooth Wireless Audio Music Receiver Adapter w/ 3.5mm Stereo Output for Headphones Portable Speakers and Car Stereo Systems - Black
We found 2 Reddit comments about XINGDONGCHI USB Bluetooth Wireless Audio Music Receiver Adapter w/ 3.5mm Stereo Output for Headphones Portable Speakers and Car Stereo Systems - Black. Here are the top ones, ranked by their Reddit score.
Makes any stereo a Bluetooth sound system capable of wirelessly playing music from your mobile, iPhone, PC, MP3 playerMini and portable bluetooth music receiver with 3.5mm audio cable.Standard 3.5mm plugs, compatible with any car stereo or speaker with 3.5mm audio jack.Up to 10M/32.8ft transmission distance, enjoy music freely anytime, anywhere without the bound of wire.Fantastic sound quality and easy to pair and connect.
This is the one I bought. It says unavailable now, but you get the idea.
With these two you wouldnt even need the aux input devic you linked too.
https://www.amazon.com/MWIN-Highway-Cassette-Converter-Compatible/dp/B01FZRRULY/ref=sr_1_1?ie=UTF8&qid=1466095607&sr=8-1-spons&keywords=tape+adapter&psc=1
https://www.amazon.com/XINGDONGCHI-Bluetooth-Wireless-Receiver-Headphones/dp/B01CHXPK02/ref=sr_1_10?ie=UTF8&qid=1466095699&sr=8-10&keywords=bluetooth+adapter+3.5
There is also
https://www.amazon.com/Audio-Cassette-Adapter-Bluetooth-Receiver/dp/B00I3YLHAC/ref=sr_1_1?ie=UTF8&qid=1466095792&sr=8-1&keywords=cassette+bluetooth
but it has a battery that you would have to keep charged.