My 126 used to vibrate so bad I thought I was going to lose control at highway speeds. I wound up rebuilding the whole front suspension, definite grunt work but fairly straight-forward and rewarding.

If your vibration is severe, Check the condition of the rubber ball joint boots including the upper control arm and the tie rods. Check for excessive play. Check the rubber bushings for cracks or deterioration. These parts wear out and need to be replaced after a long while. Also, the steering dampener is cheap and easy to install and could be a starting point if your wheels and alignment are within their proper parameters.

Good luck