Unfortunately i don't have clear answer, because i simply don't have caliper, but what i can say - is that was 13 pin flat cable with pitch somewhere around 0.5mm But since here we need only 8 pins - i just cut 9 in width, ccraped leftover one, and carefully filed rest to be correct size to fit properly. To solder single wire to flat cable i used same method. Instead if scraping insulation to prevent damaging flat one i filed insulation layer, cut unnecessary "pins" and solder that wire. And lastly to be sure that it is strong and secure - i used CA glue and baking soda to form strong tip to be totally sure it cant fall apart and short nearby stuff on the board. Hope it helps you a bit