hi guys need some help since i will be installing a dd on my 04 g35 coupe non bose shortly

i bought a used metra kit its just the hvac controller and the front Radio Housing no other parts

my question do i need the other parts that come in the kit? or can i reuse the stock brackets from the stereo im removing ?

 

The stock bracket is the only bracket you'll ever use, whomever sold it to you probably threw away everything they didn't use in their install, so you probably won't need any of the other pieces.