Most things for 350Z and G35 will fit. Check here for good stuff:
https://www.z1motorsports.com/advanced_ ... .php?t=SPL
I have the SPL end links myself. They also have many other various camber parts too and stuff with much higher strength for being lowered.
There are a few companies with adjustable front upper control arms, but most of us (myself included) use Eibach.
https://www.autoanything.com/suspension ... 9A0A0.aspx
I ended up changing my setup around since I last posted in the suspension thread. Got rid of my lowering springs and KYB shocks after I blew out one of the shocks. I went coilovers now. I think I used D2 brand? Megan stopped making their good ones and only has a junk model now. My coilovers arent "true", they have a separate spring and shock in the rear like most coilover models do. However if the coils you got are "true" in the rear, where the spring is over the stock, then you could replace your whole spring perch that you no longer need with these arms:
https://www.z1motorsports.com/suspensio ... 13005.html