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Hi I'm Brian and I'll be happy to help you resolve this!
1)The White with Brown stripe will not be used for your installation so insulate the end of it.
2)The new black will go where the old black was just as you thought.
3)The new brown will go to the capacitor terminal that had a single wire on it that was ONLY the old orange OR blue (I suspect blue but you need to confirm that).
4)The remaining new white wire will go where the orange OR blue was where the orange or blue was NOT by itself on a single post on the capacitor. This could be on another terminal of the capacitor that has other wires on it too or it may have gone straight to the contactor.
Let me know if this isn't clear and if you need further help. A picture of your control panel may be needed to clear it up if my instructions above aren't clear. You can upload pictures here using the "Attach Files" button at the bottom of your reply dialog window.