A professional from Wheaton IL says:
June 14, 2016
I have a profile cylinder I need to replace. do you have one exactly like it with the split turn? Picture is included
Dave from SWISCO responded:
June 20, 2016
Thanks for posting. The first part that comes to mind is our 40-123 Kiwckset key cylinder. Could this be what you have? I'm just not sure what handle set you have, which may impact whether or not the 40-123 can work for you. If you'd like, you can show us a picture of the handle set and we can confirm.