1993 Cadillac DeVille Owner's Manual - Page 315

If you only want replace the wiper inserts follow these steps: to 1. Disconnect the wiper insert by bending the end of the insert gently using pliers.Then pull it from the housing retaining tab. 2. Now pull the insert from the blade housing. 3. Reinstall the new insert by aligning the blade housing tabs and the the edge of the insert. Make sure that insert is connected to all the housing tabs. 4. Install the wiper blade assembly to the wiper arm.