Jamestl: search via google for Whiteline Com-C adding to search terms site:ft86club.com , there well be several threads on it.
In short, maybe due strut angle on twins that made unacceptable sideloads, maybe due spring perch touching outside of bearing (but people tried with washers/modified spring perches and they still failed), bearings had tendency soon to bind (sooner for those that tracked), thus resulting in noise when turning wheel, as spring on turn skipped, making worse steering, and wear on spring/strut. Whiteline tried some revisions with different bearings, but none was confirmed to fix issue in long run. People ended up with refund and delisting twins from compatible applications. Those that wanted rubber top mounts, reverted to stock, or group N ones, both non eccentric unfortunately. Those that needed camber adjustment at topmount, got camberplates. Both options fixed binding topmount bearing. Some shops still list/sell W.Com-Cs (KCA335) as for twins, but you've been warned. Supposedly they work with more success/less failures on imprezas (maybe due their heavier front, maybe due different strut angle, who knows), providing extra camber for those that want to compromise NVH less.
At the end i ended up using rubber top mounts + camberbolts in both holes + powerflex eccentric bushing in front LCA, with ~-3dg front camber at stock height. But would have preferred Com-Cs + camberbolts .. if they had worked
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