How to play iPhone music through my car radio with the LifeProof case?

I have my iPhone 4 in a LifeProof case. My car does not have an AUX input so I used to play music with the Griffin iTrip FM Transmitter. The transmitter no longer fits into my iPhone charging port because of the LifeProof case design. Is there another FM transmitter on the market that fits the iPhone 4 with a LifeProof case? Or is there another way for me to play my iPhone music through my car radio without having to make a million CDs?

Why bother? Here's what I did http://electronics.mcmelectronics.com/search?w=mp3+player

I got the $10 unit with remote control that plugs into the cigarette lighter and has a remote control. I get more storage on an SD card or memory stick anyway, or I can plug my iPod into the port.

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