front cv joint hub nut size k12 2004 reg

can someone tell me the socket size required to undo the front hub nut attached to the cv joint as im taking the gearbox out.
 
If I'm looking at the correct HUGE socket in my toolkit, it's 30mm :).
 
if they,re anything like the k11 hubnuts, there are various different sizes fitted lauro, (30 and 32mm, depending on nyloc or castlenut) the most obvious option would be to measure your own
 
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