Hi, new to this, and sure it has been covered before. Just got a mark 2  , but no sign of wheel nut key.  Seems to be a 15 spline one,  or so my photo indicates, BUT  replacement I ordered is too large- seems a larger diameter than cavity. 

This is where someone tells me there are different sized wheel nuts, but who knew. 

Need one, asap  'cos my car , a 1.9 tdi, has never had a cam belt change, and I have arranged it for next week. 

Bill T

See below, and I'd suggest a read of the whole thread as well ...

 

 

So, Mike’s diagram suggests a 60/15 point rather than the ABC 15 point I bought,