if youre getting it installed by like bes tbuy or streetheat they should be able to cover al lthe rest,

but just saying

looks like distribution block, 4 guage wiring and lots of it, a few rca's, a box fo rthe 12/s

hmm prolly a bracket or 2 to hold the box, and cap down, lots of screws for the amps, a wiring harness for the HU, a bunch of like 12 guage wire to turn ons and the x over