Honda-SOHC

I have a cb550f supersport and am nearing the end of my build. I have just ordered an antigravity 8cell battery and it recommends you replace the rectifier with a modern one. I have purchased a combined one from David silver spares which means I can also lose the bulky stock reg too which will help no end with the available space in my electrics tray I have fabbed up.
So my question is the new reg/rec will plug straight into the connector for the stock reg 3xyellow wires 1x green and 1x red. However I have a white, green and black off the old reg and only the double ended spade wire left on the new reg(see pic).
Can someone tell me in laymans terms how to finish this up and what goes where exactly?
Thanks in advance!

Can someone please help...

I have changed the stock 5 pin ignition switch for an aftermarket 4 pin switch. I was told to combine the two brown wires on the stock harness to give me four wires to connect to the four wire new switch.
 This switch has two key stages, first is a dot and second reads ignition.
When the key is in the first dot stage I get all lights and speedo lights up with built in idiot lights. When turned to ignition I lose the back light on the speedo (aftermarket speedo with built in idiot lights)?
Also when in ignition stage I get nothing on the start button however when turned back to stage one the start button works??

I'm confused😩

Hello all.. I'm new to this forum and currently have a '77' cb550 supersport as my first cafe build! I'm getting through the project and really enjoying it! I am fast approaching the wiring harness and several attempts have been made in cleaning it up but I am losing patience! I would like to fit everything under the seat in a fabricated tray but looking at it every night with a puzzled face as to how it's going to fit is getting tiresome!
I really like the look of the motogadget m unit and was wondering how easy this is to fit with stock everything.. switches ignition controls lights etc! The only aftermarket component I have is a universal speedo with all the idiot lights built in!
Any experiences advice would be very welcomed! Thanks in advance!
Alan