Adding Aux input to Stock HU?

[Jaymez]

I have a 2006 Pontiac Appliance. Is there any way to add an aux input to the stock radio even without there being an aux button on the face? It's a single disc (MP3?) non-Monsoon unit. I tried looking at Cruthfield's website, but, it keeps erroring out. I also didn't find any upgraded factory HU's on eBay in the off chance that they might have the aux jack.

I'd really rather keep the factory HU as opposed to buying some sort of aftermarket unit.

 

[Sandman]

I'm running this in my car, pretty happy with it. It runs inline of the antenna and simulates a radio station.

Amazon.com: iSimple IS32 TranzIt USB Universal Car FM Radio Integration for MP3 Players, Smartphones, and Tablets: Car Electronics

 

[Jaymez]

Awesome. Thanks. Looks like it'll solve the problem with my car and my wife's Sport Trac as well.