Renault UN1 Quaife O-Ring

Hello all, question regarding the fitment of the quaife diff inside the UN1. Transposed everything across fitted new bearings etc. however the old output shafts had a machined rebate against the output bearing on the new quaife diff does not have these rebates. Any idea how these are sealed as there is absolutely no point sticking an o ring on a splined shaft.

James
 
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