120mm Fan Spacer

[haaammit]

Allo all. I've been putting my new build together, but have found a small snag. The side of the rear 120mm fan is covered by part of the case and I want to see that side of the fan. Is there a spacer easily available? Wants to be maybe 10/15mm thick. I've had a search but can't seem to find what I'm after - maybe I'm searching for the wrong term?
Any ideas welcome - ta

 

[haaammit]

I found some 120mm silicone rad pads and stacked enough together in the end.
ty for the ideas