I asked the seller if this cable is compatible with the HP 14-ac100na. The seller answered that they do not have a cable that matches this model.
Just to let others know, this is the cable you need if you wish to add a hdd/ssd to your 14-ac100na. Works great and has made a massive difference to the machine. Just need to fold the cable accordingly and there is a space for an internal 2.5" hdd.