Need part # for speedo cable

More Information for ATP Y819 (rockauto.com)
More Information for PIONEER CA3014 (rockauto.com)
These are B body cables, but if I recall correctly, a little extra length is needed for the OD trannys anyway.
You're right, the correct A body cables are getting tough to find- too many places have the wrong cable ends listed. Those 5/8 ends are meant to be used with VSS units on the trannys, not gear drives.
Right cables, but not parts store prices:
Imperial Services - '60-'76 A-Body Parts
Thanks I'll look into those