I posted this on RC earlier, but it may be useful to someone here. If you have any fitment issues with the Aquasurf cables it's not too difficult to make your own.
HOSA MIDI cable.
Pins 1-5 starting on the left
Strip the outer shielding, on this particular cable, ping 3 is the ground, you only need about half of the copper.
On the AquaSurf cable only pins 2, 3, and 5 are used. So I cut the other cables down at the insulation. You need to be very careful not to short out and pins because #3 isn't shielded.
Pinout
RJ45 connector with clip facing down:
1 2 3 4 5 6 7 8
5 3 x 2 5 3 x 2
Works like a champ now and actually fits without any tape or rubberbands.