Sliding closet door question

[Mad Dog 98]

Hello. I have a 2006 Fleetwood Bounder DP 38N motorhome. The rear closet mirror doors slide on rollers. I found a black piece of plastic on the floor underneath the doors and a small bolt. Apparently there is a small black plastic piece between the bolt and door. I am looking for anyone who has replaced these before that can direct me to a replacement part. I attached a photo of the other door with the black plastic piece and bolt in place. The photo, for some reason, is sideways. The left side is actually the top of the sliding door. Thanks!!

[homerbw]

I am not sure this information can help but I found sliding screen door parts work on my sliding closet doors. Parts can be found at any hardware store.