I had to enlarge my hole by less then 1mm and I used some kind of water proof epoxy (can't really remember the name) to attach the sidemarker to the fender. It's been more then a year and everything seems to be fine.
[img]http://albums.photopoint.com/j/View?u=1144642&a=8407091&p=27157646[/img]

-Aleksey
98 LX
practically stock