[chincars]

Hope this helps...

1. Determine all four bolts are identical
2. Take one of the good bolts and match is up with the corresponding die.
3. The correct one will screw in smoothly and snugly with no free play.
4. If the bad bolt is not too far gone, you can try and put it in the corresponding die and "clean" the threads. You may want to apply WD40 to everything when you are doing this.
5. Now take the corresponding tap and try to clean out the mounting hole that is part of the cars body, once again take it easy and use some WD40.
6. If the mounting hole and the bolt you just "cleaned" are not too far gone, then it may work... Does it feel snug when you screw it in? Or is there some play?
7. You may have to go one size larger with the tap and open up the mounting hole, then go to a hardware store and get the correspnding larger bolt.

Hope this makes sense...