I can answer a couple of your questions, as I have been considering these for my 05 and have done some research.
1. Since you are getting them right from Whiteline, can we can custom spring rates? The flyer on the website says yes. I want higher something like 300F/350R or 350F/400R for AutoX.
Whiteline has a race version that comes standard with 9k/8k springs and the appropriate valvling to match, at no extra cost
2. Will these fit the Noltec front castor/camber plates? I need camber for AutoX.