Hello and welcome to the forum!
You're in luck as parts aren't too hard to get hold of, both OEM and aftermarket. We're a Z specialist, solely focusing on parts sales.
We have hundreds of thousands of pounds worth of parts for both 350z and 370z in stock and ready to go.
We also have weekly/bi-weekly shipments from Japan and the USA, so anything not stocked here in the UK can be ordered in.
SOME parts can be a little bit of a pain to get hold of but it's never impossible and worst case scenario, there's loads of people who break the Z's, meaning used parts are an option too.
Look forward to seeing you in a Z soon