A kit like Marlins is the best, but if your not running late model knuckles you don't have to many options.
4x4labs makes a set of arms that will fit any year knuckles.
I sent my arms to W.
http://www.overthehill4x4.com/index.html for 80 bucks I had my stock arms heated and bent up to clear the springs. I've been running them for two years now on a dd
Jason