Gauge pod will be pretty tough to find, RSW are/were the only ones who made a pod for a RHD Z & they are really rare.
I tried a few ebay ones on mine but none of them were even remotely close to fitting
Tarmac & CS are the best 2 to use on here IMO
Further afield and for the slightly harder to find parts then definitely RHD Japan or Nengun
Assuming parts are in stock its generally less than a week to get parts from Japan
FLI 12" active subwoofer
Seems to have a pretty good sound from it tbh but it just takes up too much boot space. Comes with a wiring kit (not pictured)
£40 - Pick up only. If you want to arrange your own courier your more than welcome but this is bloody heavy