Thanks so much for your help, it means a lot to me, does stock camber arms can run -1 degree camber?
It depends on how lowered you are. Stock suspension is gonna 0 or really close to it and will get more negative the lower the suspension gets.
Because I want to save some money for buying whole set of four cambers arms, and my car is already lowered on coilover. Also I'm little confus on the suspension arms hope you can help me out, so front upper arms = front camber arms, rear upper arms = rear camber arms, so what is front lower arms and rear lower arms? Or toe arms? What does it do?
Rear upper control arms are where the camber arms would go, and same for the front. You probably won't see much camber when lowered and those are your drive and brake wheels and you really don't want to put a lot of camber on those wheels anyway for traction purposes. I've never used them or know anything about them, but I know camber plates are an option for the front and they replace the top hats of the front struts I believe, and you can adjust camber from inside the engine bay. The lower arms are just another way of connecting the suspension to the frame, specifically the bottom mounting point of the strut. Toe arms are tie rods, that's how you steer and they are adjustable to set the toe on the front wheels. Just google how a car suspension works or car suspension diagrams and look through pictures and click all the links until they're purple.
Since you're already lowered and already have some natural camber from being lowered, you're probably fine to get your wheels and tires now, worst case you rub a little and take the wheels off and put whatever you had back on while you wait for the camber kits. Look through those other links and decide what tire size you like best. Mount and balance your new wheels and tires and put them on the car, 8.5" shouldn't cause too many issues and I suspect the only thing you'll have to do is roll the fenders. I know you said you didn't want to, but you're probably gonna have to roll at that width. They aren't too expensive online, you can also go to an advanced autoparts if you live in the states and see if you can rent one. They have a lot of tools that you can rent for $50 and you get the money back when you return it. Once you get your camber kits and get everything together, go get a professional alignment and tell them how to adjust the camber arms and what you want them set to.