402 drophead...doorlocks..
The concentric mouldings between ID & OD may be original, but just as
likely/easy to be formed by shape of relative components in situ under
compression.
I'd suggest going to local tyre shop & begging scrap inner-tube of approx
right thickness, then cut to size! A kitchen apple-corer might provide
internal hole dia. used as stamp, whilst pastry-cutter might do OD.
Rob
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