NAPA ATP 13308 it's the same inner seal that's used on the newer transmissions. Ma did carry one part over
https://www.forbbodiesonly.com/mopa...p-new-residence.114133/page-34#post-911546492
Kid, the part you gave here looks like an actual seal, not an O ring. Have I been chasing ORings when an actual seal is needed? That seal looks like it would be a better fit on the adapter- assuming the size is correct? Have you used one of these seals on a cable shifter?