Just bought a set of Konis and on the rear set found the diameter of the lower mounting hole too small for the factory stud. Called Koni about it and they told me I'd have to drill out the mounting bushing, but to be careful about screwing up the rubber ... thanks a lot! For $120 each, you'd think they'd fit ~ Anyway, an 11/16 drill bit did the trick, leaving about a millimeter of bushing left.