Plugin icons missing

I am updating a custom Confluence server plugin from v6.6.5 to v.7.1 and notice that the icons listed on https://developer.atlassian.com/server/confluence/icons/ do not seem to be present any more (maybe since 6.7?). Are there replacements? These are not AUI icons and AUI does not have all of them so cannot be a direct replacement (eg icon-space).