What components do I need to finish my shower installation?
Look at the bottom of the Amazon page where it says "customers also bought this" there's trim kits there that have exactly what you're missing. Pretty typical for a contractor to use a rough in kit like you did and then let the customer pick a trim kit later. The only problem you have is you're limited to trim kits that work with the 01-31XA valve body. You should be able to find one you like. Here's one Pfister 01-8CBC Three-Handle Tub and Shower Combo, Chrome
Fits 01-31XA valve body
The Pfister Three-Handle Tub and Shower Trim Kit comes with classic Brass Cross Handles, flanges, bell-shaped shower head, and a threaded tub spout. The upgraded Polished Chrome finish and Brass Cross Handles is a great addition to any bathroom. Valves not included.