Monaural hearing aid blue plug 'both channel' direct input leads

Which of the leads below should I choose? All of the below leads are S leads - that is to say that they are for use with one hearing aid - they are all the same aside from a choice of length.

These leads, while they are for a single hearing aid, they will give you both channels from a stereo sound source. 

Please note - with Oticon hearing aids the listening volume using a personal stereo direct input lead can be quiet.  Therefore, if you have an Oticon hearing aid, we recommend that instead you should use an fmGenie direct input lead.