Plastic glides under wheel. Stanley mirrored closet doors, installed 2005.

Thanks for reaching out! I'm sorry to say we are not able to provide you with a replacement recommendation for the guide locks you have here. Stanley stopped producing closet door replacement hardware quite some time ago, so I'm not certain they're available any longer. That being said, we have found that the rollers do operate in the closet fine without them. 

This shoe can be replaced with the 23-041 Mirror Wardrobe Door Roller assembly.

Dimensions for 23-041

Alternate view of 23-041