The diameter of the centre sphere

[something_wild]

Havn't got access to my car for a couple of days so cant measure myself
Anyone know by any chance???

Massive thanks in advance!

 

[Legume]

I measured 67.40 for front and 67.60 for the rear. So I would guess its 67.50 with a 28mm axle shaft (vernier calipers across spline to spline grooves)

 

[something_wild]

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Your a gun Legume, thanks!