Pickups: If those are the way the wires came from the factory, then the black wire would be the signal connection, the twisted green and braid wire is the ground connection and gets soldered to the back of a pot, and the red and white wire allows you to tap the pickup using an extra switch or a switched pot (to take the connection to ground), for a single coil sound. If you don't want to do this, then just wrap the bare end of the wire in some insulating tape or cover it with heat shrink. Don't cut it off, as the wires join the two pickup coils together and you won't get any sound.
Yellow wire: This is for grounding the bridge and strings. One of the holes for the bridge ferrules will have a hole drilled between it and the control cavity. Before you fit the ferrule into the body, you need to fit the wire into the hole, bare the very end of the wire, and the ferrule makes contact with the bare end when it's pressed into the body. The other end gets soldered to a ground connection on the back of a pot.
Angled metal bit: That's a bracket for the pickguard (if you wish to fit it). The long slot is used with a short bolt and nut to secure it to the hole in the pickguard, whilst the short part of the L is screwed into the side of the bass. Same as on this Les Paul...
Last edited by Simon Barden; 29-05-2018 at 06:51 PM.