Speedometer mounting rubber washers

[Uncle Bob]

I've go the speedo out of my standard A-body cluster, and the two rubber washers for mounting the speed in the cluster have disintegrated. I didn't see them listed for sale at the usual suspects so I wondered what to substitute for them or where I can get the right part?

ETA: I found a couple of washers on the back of a cluster I should've tossed out years ago. I'm glad I didn't now.

I think if you save the metal cup washer part you can just use a grommet or a rubber washer between that and the back of the cluster.

 

[RedFish]

A grommet from Amazon/wherever might be sold in a package of 10. You only need the I.D. and O.D. to go shopping. Aftermarket doesn't need to produce what we can buy anywhere.
Amazon.com : 1/4 ID rubber grommet
If Someone like DMT has them they would likely be in a package that includes the flat sheet like piece of rubber and the rubber washer at trip clock reset stem.