same problem on my 172 going for top mounts but for the mean time the welders coming out any idea of the hole size 45mm sound about right only my drivers side has worn other sides dented a little like its been hit with something from below/strut ,i put a set of refurbished shocks on her but never even noticed the holes ,until now as i've gone through the list bushes ,balljoints,bearings,track rods-tracking ,the better it got it also had a hard to explain flutter on drivers side as if the geometry changed and the wheel steps over.only just found out this said head scratcher.