If you're looking to extend the 6-pin cables already on the PSU, you're going to need a socket with male pins on one end and the typical 6-pin with females on the other. A double-ended female cable isn't going to do it.
Just got back from Lowes Hardware. (Got a nice 4 shelf wire rack for my miners, PSU's, network switch, etc. Also have two 20" window fans blowing UP from the 2nd from the bottom shelf. Everything is running again MUCH cooler with more breathing room!!)
Anyway, back on topic....
I wasn't really thinking of extending them. The cables are very, very short. I did not get the Antminer PSU from Bitmain, so they may have substituted shorter PCI's.
I was hoping for a whole new set of cables so I can put the PSU on the top shelf with my other PSU's and the miner on the shelf below with the others. Right now that is impossible with the cable lengths.
24" cables sound great!
I am exhausted from todays renovations, so I will be back tomorrow to place an order, perhaps.
Best wishes and thanks for the information!