You can choose from dozens of trem and hardtail options – most popular are Callaham, Super-Vee, Floyd Rose
You can choose any make and model, but I have found the wonderful Ratio tuners from Graphtech to be the best.
Plates and screws
Stainless steel neck-plates and screws allow for a solid connection between neck and body. In most cases, stainless steel screw will be used throughout the guitar.