The other day while going over some rough road, I felt something "shudder" and then heard a sound, and then the next thing I knew I heard an ongoing metal-on-metal clank.

Got the wagon up on the stands last night and discovered that the driver side front shock is loose. The lower retaining bolts are completely sheared off at the lower control arm, leaving two little stubs. One hole is packed with grease and grime, so who knows how long I've been driving around with one lower retaining bolt.

So, is this a big deal, being sheared off and all? I don't think it's necessary to buy a new lower control arm, is it? Should I just drill out the remaining bolt stubs? Can I leave the whole assembly in position, or should I disassemble for the best result?

Thanks in advance,