This part is the roller on top of the shower door. I've photographed the good side. The other side has broken off. The part is labeled Allen Steven Corporation, A53937. If you can find this part, I would be grateful.
Thanks.
Tricia Newell
Paul from SWISCO responded:
August 30, 2017
Hello from SWISCO.com! Allen Stevens has been out of business for some time now. We suggest our 10-152 shower door wheel assembly as a good replacement. If you just need the wheel, please look at our 10-141.