rim lock mounting

I'm replacing the original rear wheel rim lock / security bolt with a new one. The original has a rubber washer that goes against the rim under the flat washer, and it shows in the parts list drawing but doesn't seem to be included with a new part. Can anyone say if that rubber washer was just a flat or was it shaped to cradle the rim center? Mine is crushed and split and not reusable so I can't tell.

And yes, I know many people don't use them. I don't care.

Just a flat washer although the ones I have look like leather, not rubber.

I think the originals on my 74 were fibre of some kind but they are dust in the wind now.

Thanks. I have nylon and fiber washers in my hardware bin, I'll find something that fits.

maylar said:

Thanks. I have nylon and fiber washers in my hardware bin, I'll find something that fits.

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Replacement rims I recently purchased did not have a hole for the security bolts in the rear wheel.
I was told they are not required because the quality of rubber used in modern tyres negates them.

Ratboiler said:

I was told they are not required because the quality of rubber used in modern tyres negates them.

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Or perhaps, "They're not required because we don't want to drill an extra hole and stock front/rear rims separately". As I said, I don't care.