Yes, your wiring for the VR115 is correct. I don't cut the plugs off them. The wires are too short to reach the harness plug so I just make up an extension that will plug into the VR115 and then the harness. The length would vary depending on your mounting location and the harness plug location. Your '73 may mount the regulator and rectifier in different spots compared to my '78.
For the regulator end, I just use individual 1/4" spades, no plug .....
I combine the orange (or red) and yellow into one crimp on the harness end and use a connector plug that mates with the harness.
The rectifier wiring is pretty simple. There is a wiring diagram on the side of the unit. The 3 tabs in a row, the ones with the "squiggly" lines on the diagram, get the 3 white wires. It doesn't matter which white goes to what terminal. The "+" tab gets the red wire, the "-" tab gets the black one. I make up "L" shaped brackets to attach the rectifier to and then hang it off the bottom of the battery box. I also like to incorporate a tab on the bracket to hold the wires. Here's some I recently made up .....
