Help Identifying Speedometer Cable 69 Chevelle?

[69L78]

I have had this for years, I believe it is from one of my 69 Chevelle's, it is 80" L & the code is CD. Any help would be appreciated before I sell it.

[SS69chevelle]

info below isfrom 69 chevelle build sheets;

CR-M38/M40 Auto trans
CS-M20/M21/M22 trans

not sure what the CD application is, might be later year.

[Kurt S]

And CD isn't a Camaro code.