DT175MX Ignition switch

Hi, First time I've posted on the forum. I'm struggling to try and sort out the wiring on my 81 DT175MX. I can't find the right ignition switch. After buying two, I'm wondering if the harness is from another bike. There's a 4 wire block with red,brown,black and white,black, which is the ignition and engine stop, and theres a 6 wire block that goes back to the light switch,indicators and horn. The colours on both the new ignition switches dont match. Any advice would be appreciated.