Can't really see - it just looks like the mounting plate for the filter, may have a smaller inlet hole than the carb inlet. You would need to un-do the two screws and remove it - then measure the hole sizes!
They do appear to the same size but my sight aint what it was.
when fitted I can feel a slight lip though probably about 1 mil
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btw, is the filter seated in the correct manner?[frame][/frame]