signal lever advice?

[chewychevy67]

I am adding 68-70 cruise control to my 67 gmc and i am undecided on this so i thought i would ask for your advice. do i use the 67 only signal lever or the 68-70 signal lever? in 67 only cars had cruise available so that lever would never have been in a truck. I do have both types so i dont need to buy it. there is a picture of a 68-70 below. the 67 is identical with 6 vertica l(when installed) lines groved into the plastic handle. I will add a pic of it as soon as i can.