Let me check. I think I have a front yoke, but not sure of the size or if it will work. Do you know the cup size and overall length? If I can, I will see if I can put my hands on it and take some pics and count splines.
IIR, I have the close ratio T-10 for the 65 GS, but put in a Wide Ratio and I think my 64 Skylark yoke was the same, so I should have the 65 GS yoke that mates to the close ratio tranny.