12 conductor 22awg DC power cable recommendations?

I have a new-to-me Krell Evo 202 two-chassis preamp and the umbilical (between the power supply and the preamp section) is too short for my shelving configuration. Alas I will be forced to make a new one. Existing is ALPHA WIRE 1299/12C which seems to be unobtanium in lengths shorter than 50 feet. 

As this cable is doing power, not signal, I am not too picky but can anyone recommend a different and high-quality cable that would be suitable for this job?