Those cassette adapters for a 1/8" audio jack have awful sound quality, break frequently, and are usually around $20, not $5. You would be better off upgrading

Those cassette adapters for a 1/8" audio jack have awful sound quality, break frequently, and are usually around $20, not $5. You would be better off upgrading the stereo, unless you just want to play tapes or listen to the radio.