Normally you re use the factory dust boot. Most aftermarket struts re use them with Bilsteins being an exception.
The struts ship with new strut nuts and unless you're also lowering the car significantly you can retain the factory plates. Also they mount at the factory locations on the spindle.
I just installed a set of these on an 01 GT and it was pretty straight forwards.
12 Black GT500 SVT PP l VMP TVS l JLT123 l O/R X l 28x11.50Rx15 M/T Street R's l BMR Suspension l Recaros
03 Sonic Blue 3.8 / 17 Magnetic Fusion Sport 2.7 EB