Upgrading to 9/16" wheel studs is never a bad idea, I honestly would reccomend it to anyone running anything other than stock wheels. The stock 1/2" studs work ok, I've ran thick aluminum wheels on the short stock studs for quite a while years ago, but after my 92 went into tricycle mode, 9/16"studs for this guy. I'm running stock 2008 17's on my 91 with 1.5" spacers, and the tires barely stick out of the wheel wells.
[ame="http://s1220.photobucket.com/user/CumminsPower59/media/91%20W350/IMG_20140122_093832149.jpg.html"]IMG_20140122_093832149.jpg Photo by CumminsPower59 | Photobucket[/ame]