Sway Bar Links 6" or 7"

[Aggiesrok]

Replacing upper control arms and realized that the sway bar links are not tight. In fact you can't tighten them any more, they are 7" and it appears that I need 6" in order to torque them down. There are both lengths available for purchase, so which is correct? Obviously 6" is what I need, but now I am concerned about the sway bar itself. I guess with it being loose, it just won't help much, should I see a big difference with the correct size? Thanks.