There are two size pulleys, depends whether it's an "early" or "late" 300 Tdi.
I just went through this with my defender 300 Tdi - I got the larger pulley on the new alternator, but the belt still fits properly and the tensioner is doing its thing. The larger pulley needs a longer serpentine belt.
I'm told that it either fits or it doesn't.


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Count the grooves, seems he has fitted the wrong pulley, like you suspect

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