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Does anyone have these and can measure the outer diameter and thickness?

These appear to be common conical washers with a 3/16 id.

It seems like a common 3/16 conical washer can work in the correct thickness.

Does anyone have the Schumacher Rear Wheel Cone Washer (2) SCHU4188 for comparison?

You can use a shim and a washer to approximate this spacer. Dunno offhand how thick it is but it's more than 1/16" and probably less than 3/32". You are really just looking to fill that gap so it all stacks and acts as a solid spacer.

Factory works sells some stepped washers that are very close.

jwscab wrote: ↑Fri Dec 31, 2021 2:33 pm You can use a shim and a washer to approximate this spacer. Dunno offhand how thick it is but it's more than 1/16" and probably less than 3/32". You are really just looking to fill that gap so it all stacks and acts as a solid spacer.

Factory works sells some stepped washers that are very close.

Thanks for the information that helps.

It looks like the spacer serves the same purpose as the cone washer on the older bushing based rc10's. The proper sized belleville washer would be a neat addition since it would provide some spring, but I'll likely just pick up a #8 plumbing washers and grind it down.

juicedcoupe wrote: ↑Fri Dec 31, 2021 4:36 pm https://www.ebay.com/itm/Factory-Works-Wheel-Spacer-Backing-Plate-3-16-Axle-vtg-RC10-Worlds-Replace-9608-/303748279630?mkcid=16&mkevt=1&_trksid=p2349624.m46890.l6249&mkrid=711-127632-2357-0

Those are on my watch list. I'm just looking to see if there is less expensive different route.