Stop in for a cup of coffee

So, I need 1.780" OD dust caps for my duster (9 inch drums) and I cannot find them anywhere. Dorman makes them but EVERYWHERE they are, they are out of stock and backordered. even dorman themselves is out of stock. Does anyone have two or even just one dust cap for 9 inch drums?
The ones off of my lawn mower were the right diameter, but they were half inch too short.
I'm at a loss.
1 and 7/8 or 1.78 (about 1-3/4)? I found one very beat up one that is about 1-3/4 in my hardware accumulation. No clue what it is from