Originally Posted by TheOldMan
Unfortunately the spring is integral to the grip panels. If you can figure out a way to retension the spring, you'll be good to go. Aside from that it appears you may have to go with new grips... What probably happened was someone pried up on the spring rather than slide it over to remove the grip panel(s).
A google search might provide you with a new set of grips, though I am not sure about that. The grip latch is the weakest feature on that pistol and a lot of people are looking for grips they ruined by not realizing, and not bothering finding out, how the grips are removed.
If I were unable to re-tension the spring without breaking he brittle grips, I would be tempted to expoxy the one side in place.