Panel Gripper sign hardware - seen these around?

[MikePro]

originally bought these from Gyford Stand-Off Systems, almost a decade ago, but hoping that someone's come across another source for these egg-shaped 3/8" panel grippers?
(currently jumping through hoops to get re-registered, but I have no idea how long this is going to take and would hate to keep a client waiting for me to get on a vendor list.)

 

[nashvillesigns]

gripers

i have seen these....
MBS?

 

[MikePro]

MBS and displays2go were my first thoughts, but they only have cylindrical hardware for edge-grip/wire-hang