Sooo....
I got curious and looked in my Buick parts books. What I found is that the '65-'66 GS is all by itself for many of the clutch operating parts.
The rod that I've been incorrectly referring to as the upper rod is in reality, by Buick, called
" ROD, CL, OPR]". Or in English Rod, Clutch, Operating. lol
Its part number is Gr. 0.854 P/N 1373012.
The adjustment portion of the clutch linkage is made up of 3 parts.
There is an upper rod [the female threaded portion]. The lower rod [the male threaded portion] and a nut.
Part numbers are as follows.
Upper Rod Gr. 0.787 P/N 1373020
Lower Rod Gr. 0.787 P/N 1373022
Nut Gr. 7.348 P/N 1365067
Seeing this from the Buick parts book, I'd have to say that there is only supposed to be one length piece for the Clutch Operating Rod.
Now which is correct? I have no idea what so ever. lol
The investigation goes on.
Loren