The atty bolt, the bottom screws and the screw on the switch. Here's what you'll be looking for. If you find a spring let me know.
atty spring: Brass Compression Spring, .78" L, .042" Wire
Bridge bolts: 8-32 x 5/8"
Atty bolt: 8-32 x 2"
Switch screw: 10-24 x ¼"
Found everything but the spring at Home Depot. You'll need to file down a screw just a bit to get it to fit.