Wanted - Tranferbox seal

Hi Guy's I've been looking for this seal for months now. Thank's to Nissan i now have two seals which are useless for this job:cry: , as i know the box is good i am reluctant to buy a whole box just for the sake of rubber seal....Help would be much apprieciated:)

The seal is marked NGK and is visible when you remove the outer case,
where the rear propshaft goes into the transferbox.....the inside dimension of the seal is approx.9cm can't remember it's exactly
 
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