Brass terminals are hard to buy. But it is easy to build it by your own
Here is a small step by step tutorial.
Step 1: What you need...
1 brass screw 3 mm / 30 mm
1 telephone jack or another piece of plastic that fits around one knurled head screw
1 brass washer 3mm
2 ring connectors
2 knurled head screws 3 mm