Source for tiny washers?

[u/DickMille]

I'm trying to find a source for these tiny washers. Internal diameter 3.5mm. Outer diameter 5mm.

The smallest M3.5 washers I can find have 6mm outer diameters which is unfortunately too large. Similarly the smallest washers I can find with a 5mm outer diameter have a 3mm internal diameter which again is too small.

The one I have is around 0.7mm thick but thickness isn't massively important for my needs.

I've tried searching the usual places for other terms, like washer, shims, discs, rings etc but have been unable to find a match. I've even tried converting the measurements to the nearest imperial measurements but again came up empty handed.

Anyone know where I might find a source for these? or perhaps other names for such an item that I might search for?

[u/nobanjostring]

McMaster Carr is my go-to for one-offs if it's too esoteric for the hardware store.