FWIW, we created a ribbon cable for our own use last year. We got the ribbon from our primary supplier (it was actually 50-strand that we cut down to 37) and got these parts:
http://www.newark.com/3m/8337-6000/d...t=3M+8337-6000
http://www.newark.com/3m/8237-6000/d...t=3M+8237-6000
Oddly, it seems they've gone up in price significantly since last year... they were cheaper than what we found on digikey at the time, but apparently not anymore...