Lock Knobs......?? the clear plastic ring

[62BT409]

that fits into the door and the lock knob goes through it. Is there a correct name for them and where could one purchase them at/
Thanks
JB

 

[Burntorange70]

Door lock ferrules. Year One has them I ordered some last week with some door lock knobs. Got the knobs but the ferrules are on back order.

 

[62BT409]

Thank you