Mouser part numbers:
538-09-50-3121 Nylon 12 position housing
538-08-50-0106 Crimp terminal for above (you'd need 12)
538-26-60-5120 Right angle 12 position joiner (sorry could not locate a straight version)
You'll need a hand crimper to crimp the terminals. Molex and GC/Waldom # W-HT1919