I've recently bought a set of yongnuo rf-603 but chose the wrong cable to come with it. I got a three prong. It looks like what I need would be 2.5mm to 2.5mm. Is there anything special about this cable. Would a correctly sized audio cable work? Does it need to be TRS? I can't seem to find anyone in the US that is selling them (the C1) separately and it's hardly worth mailing back just to swap the cable.

