60Amp Power generator cable -- where to buy?

[Andrew S.]

I have a portable power generator that has a 60Amp NEMA 14-60 receptacle and I need to connect that to a transfer switch with a CS6364 type socket.  Does anyone know where I might be able to buy such a cable?  I'd love to have a 15-20 run, but can make do with a 10ft cable.

All I can find (and even that took some searching) is a 50Amp cable with 14-50 plug on one end and the desired CS6364 connection at the other.  

Is there a supplier I have not come across yet, or is there an easy fix.  The 14-60 plug has one u-shaped and 3 straight/flat terminals.  The difference between the 14-50 and 14-60 is that the middle flat terminal is aligned with the other flat terminals for the 14-50, and it is turned 90 degrees for the 14-60

Any thoughts?