Is this correct for swapping Master Cylinder from single to dual?

You really don't need the boot or the spring, or that plate. The boot just keeps dirt out, but unless you're driving off road a lot I can't see all that much dirt getting in there. The spring is a return spring, but on the later master cylinder a version of that spring is inside. One word of warning, you may need an adjustable push rod to get your pedal height in the correct place.