That is correct there is no reference that I am aware of in the '66 and/or '67 SM.
This is likely why so many times this little rubber ring gets overlooked.
And it will effect good oil pressure if not used.
The measurements while not 100% will give you an idea of possibly finding/making a suitable substitute.
Hope it helps.
Cheers.
__________________
When I die, I want to go peacefully like my grandfather did, in his sleep.
Not screaming like the passengers in his car. 
Last edited by Jeff Hamlin; 02-26-2024 at 07:16 AM.
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