Replacement Shower Door Runners Where Can I Find A Replacement Splash Guard For My Shower?

Where can I find a replacement splash guard for my shower? - replacement shower door runners

I have a factory in fiberglass shower with glass walls. It was a piece of plastic that slides into the bottom of the door that does not weigh more than an inch in the shower and acts as a mudguard for the water passed through cracks in the floor the door. Broke, and I am looking for a replacement, but I do not know the manufacturer of the shower. Ideas?