Hi Derek - I have a VW cable. I used to use it in my Passat wagon. I don't know if it'll work in your Jetta. If you think it will, it's yours for FREE. I sold my Passat, bought an A4 wagon and an Audi Phat cable so I don't need the veedub cable anymore.
Let me know if you are still looking for one and if you want mine. I'll mail it to you for the grand total of $0. I just want it gone.
Thanks,
-Chuck.