Sliding door replacement wheel

I'm sorry that there isn't a picture of the part prior to removal but it wouldn't have been very clear due to all of the gunk and build up from spraying WD-40 for so long before trying to replace the part. One of the wheels completely disintegrated and was not attached to the casing when it was removed the other and was semi intact with just a portion of the wheel broken off. I don't know where I can get this replacement part but I'm hoping you might? Thank you so much for your help!