Use the following link to determine what GPS antenna adapter you need.
Featured positive reviews:
By Rob Torres
Came quickly, worked as advertised. I also don’t really know where else I could have got this adaptor. Instead of having to place an aftermarket gps antenna somewhere in the car and fish wire behind my dash, I used this adapter to use the antenna already in my car which is in the best location already (fin antenna). After doing some reading, it looked like many people choosing to place the aftermarket antenna had problems with weak signal, etc. Not me. Great product.