UKPassats

Hi all, I have a RCD300 head unit. I have been googling how to install a aux connection. It seems pretty easy, a lot of people mention the Connects2 aux Adaptor kit, that's fine but would this do the job:

http://www.ebay.co.uk/ulk/itm/262011650497

Or do I have to buy the proper Adaptor kit:

http://www.ebay.co.uk/ulk/itm/111874663338

Many thanks