Exaust camshaft seal

Hi got a new seal to replace leaky one, went on a bit to easy and noticed a gap, new seal says 28-47-5.5 and old seal has 29-47-5.5 surely this would make it tighter if 1mm smaller? every time I search for seal I get the same 28-47-5.5 confused so am I help please.


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Just a bit more info my concern is did it have the wrong seal in it before or, I know the engine was replace at some point ( cambelt failure) is the engine from different year that has different size seal? Anyone?


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