Scilicone will not last...The actual bushing is made of metal...The only thing that is soft material is the seal for the bushing...I had some machined locally a few years ago,and spent more than $200 to have it done....You probably will too unless you have a real close friend with a machine shop....Also,keep in mind that the j-arms sometimes wear as well,and even with new bushings,you may still have a little play in the front end....The only option there is to have them built up and re-machined down....
Hoodlum