I'm losing my mind with this one, all help appreciated.

Recently fitted a remanufactured RH drive shaft (the long one)

Thought I would do the driveshaft seal at the same time.

Day later it's leaking. I change the seal again - leaked again. They were pattern part seals.

So ok this time I bought a genuine vauxhall seal.

I also measured the seal mating surphace on the old drive shaft and the new, incase that was wrong on the remanufactured shaft. Nope - both identical.

Still bloody leaking!!

Seal is driven in so it's flush with the casing. Same as the original that was ok but sweating a little.

I'm out of ideas. Please help