What about a stereo 1/4" male to two 1/4" mono female Y cable? Wouldn't that work as well, giving you the option of plugging any length 1/4" cables you have into the female ends? Seems to me that would be a better option, since you'd be able to use any length cables you need.
http://accessories.musiciansfriend.com/product/Live-Wire-TRSMDual-14F-Y-Cable?sku=331081
Unfortunately, gravity proves too strong for this on occasion and the TRS end falls out of the bass.