I reamed the center hole on the Honda switch for the aftermarket plug. It's junk. The contacts don't reach far enough to click in, there's a very vague feel when it plugs in so, off it goes and on with the new square plug. The two plug in hot wires are routed to fuses now and I'm ready to add the new hot feed for the headlight relays..
New harness, battery cables, fuse panel, Ground on rectifier added.
I made an aluminum blinker mount on the top of the rectifier. it's a 3 wire electronic loud style.
EDIT, I used the round plug after all. It just plugged in very hard then felt tight.