As these clips get old they become brittle and break easily, which is what happened to me. After looking through all the local car parts stores i couldn't find this particular clip, so i designed my own to be 3D printed. it's designed to be printed without support and slides into the notch in the door sill cover but it only goes on one way. It's pretty easy to figure out which way it goes so it's not a problem. There are two versions of this clip, one is 1mm thick and the other is 2mm thick. The thicker one is stiffer so it holds in tighter. I've tested both and they both hold well, there's not that much difference really.