Rotation in rear drive shaft on 2014 78

[Matt T]

I'm new to my Troopy and no mechanic I can see oil leaking from either end of the rear drive shaft, from my research I need to replace the pinion seals. I know the part number for the rear seal, what I'd like to know is it it the same part for the central pinion seal?
My other question is, should the same drive shaft rotate back and forth a little when i take hold of it. It does, perhaps 1cm. Please put my mind at rest and tell me it's normal Thanks