I just checked, and I have some DiaCompe 987 and 986 brakes with spring adjusting cams on BOTH sides. These will work fine on bosses without spring holes. I can give you a good deal on either (typically the 986 us used in front, and the 987 (low profile) in the rear.
If you're interested send me an email either through BF or via the contact link at the Chain-L site.
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FB
Chain-L site
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