How about these?
http://www.chainreactioncycles.com/chub-fixed-rear-endcap/rp-prod59128
Yeah, also 130mm only.
Maybe I will order 130mm and file it down to 120mm, might work...
How about getting someone to machine them for you?
Have you tried emailing Silverfish and asking them if they can locate the part you need? They are quite helpful in my experience.
@DragunovCZ1 started
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How about these?
http://www.chainreactioncycles.com/chub-fixed-rear-endcap/rp-prod59128