Front spindle nut size on 2002+ F50 Q45

I have a 2002+ Q45 and have some springs I want to change out.   Does anyone know the nut size on the front spindle?   The biggest I've got is 27mm and its way small.   I'm thinking either 34mm or 36mm.     I wish I had one of those measuring instruments.

don't know about the 02+ q45's but it's usually 36...
 
i think the other popular size is 1 5/8...not sure...gotta check tomorrow at work...

cool...thanx