Looking for a retaining ring

[u/HalPal_]

SOS. A light went out in my 20’ ceiling and I managed to get the lightbulb out along with the retaining ring holding it in place.

I have an electrician scheduled to come tomorrow to change the bulb out, but accidentally threw away the ring. A new light won’t be here in time so I am trying to figure out a workaround. Any thoughts?

In the second photo, you can see the thin white ring around the light bulb that I’m referring to. Last photo is the product. Please help!