I'm going to guess at what you are asking, because it isn't clear.
I think you want to play music on your car radio, using either an MP3 player or your laptop as the source.
You say "I want a direct one because they don't seem to work very well." By this, I assume that you mean that you have tried a FM transmitter, and they generally suck.
Here are the basic options for MP3 to car stereo, in decreasing order of quality:
1. Auxiliary input jack, also known as AUX IN. Your stereo might have a headphone jack on the face, or there might be a spot on the back of the stereo where a CD changer could be plugged into, and you could run a cable from the back of the stereo to the car.
2. Cassette adapter. Decent, but not great.
3. FM Transmitter. Sucks.
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I can't read your signature. Sorry.
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