Cheap spacers often cause noises that are hard to track down.
Since you've got so much into your bike already, why not get the best headset spacers?
Chris King® Headset Spacers are compatible with all threadless systems and forks, regardless of brand.
It's easy to add a little Chris King® to any bike with these precision made headset spacers.
Click for Chris King®
Headset Spacer Kits