Sliding Mirrored Closet Door Roller

Hi, please take a look at the attached. I have these rollers on two different sets of sliding closet doors in my home. On Saturday, the plastic part on one door cracked. I went to Lowes and Home Depot to find replacements, but they had nothing similar. So I called Paragon Schmid, which is the company whose decal is on the back of the doors, but they said that they don't do closet doors. So I'm back at square one. Hoping you guys have something similar. or at least a suggestion on how to replace the roller assembly.