If your eccentrics are white plastic, then they are Bosscat ones, and yes they are much narrower than the Procat ones. So sounds like that is the problem.
The kit plates and carriers were round, and you had to glue sandpaper to the back of the plates i think!! There was a revised part released that was a hex carrier and matching plate. I think they were white plastic, but can't remember for sure. The ones you show look like alloy? I don't remember if there was an alloy "hop up", possibly. Or they could be a different version, or my memory could be dodgy.
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Matthew White
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