Tehmaster

So I just got back from picking up some parts and was looking to you guys to see if I made a good purchase, I got the front brakes, control arms and hubs set up and then I got the entire rear axle off apparently a 2006 SS. The guy just had them sitting outside beside his shed. I've got a few pics and some questions to follow.

First 2 pics are of the front brakes, was wondering if they are any different from the stalk 07 lt brakes.

Third pic is of the rear axle,I know it's not a great pic but I was wondering if I should be concerned about the condition of it or if it's normal for the amount of rust and such.

Obviously I will have to change the rotors and get new pads but can calipers that have been off of a car and sitting in the weather still be used?

I can provide more pics if needed and greatly appreciate any and all help and advice you all could give.