Still vibrating

[mr benz]

I have a 190 e 2.3 1987 benz, i have had a lot of balancing done to the benz, infact the the gsp 9700 was usedthe last time and my car still vibrates when i approach 50-60mph, i also just replacedthe the struts and shock all the way around, the labor was done by kaufamann tires. Im so sick and tired of this problem , i spent over $1000 and i see no differnce in the smoothness of the ride. What should i do? I feel like im on my own. I dont want t o take it to the dealer now and spend another$1000. ive decided to try to remedy the problem on my own by replaceing the steering wheel shock/dampner. I read about it in a search on this forum. what else can i do to see if i can isolate and fix this problem?