Westone 4R cable replacement - 2-pin vs. circular?

[robbyvegas]

One of the channels on my 2-3 year old Westone 4Rs has gone out.  The problem is that the harder plastic coating that holds shape right around the ear has cut into the sheath of the twisted cables over time.  So, it's time to replace them.  They are the 2-pin connection.  Whenever I search Amazon though, the cylinder/circular cables are what come up from Westone.  Is it just that these are old now and Westone has moved on to the circular connector, or is there supposed to be a way to use the circular connectors with these?  Any suggestions on cables?
 
Thanks,
 
Rob