Works great, thanks!     I got here for $10 + S&H:  http://www.jr.com/sennheiser/pe/SEN_531406/     No detectable difference in the sound to my somewhat picky ears.   I just used nail clippers to trim two very small pieces of the plastic circumferential ridge - one on each side.  The straight connector then slots perfectly into the connector in the left can of the P5 headset.   The cable I received measured 58".