Jeep Commander 2007- 4.7 ltr- shake in front right at 110 km/hr speed

I experience a shake in the front right side and feel in the ride at 110 km/hr and higher speed. The Car dealer mechanic in Dubai ( where I purchased the car) tells me that the apparent cause is mis-matched tire threads and non matching tire manufacturer which was caused by one time damaged tire replacement. Even after buying the matching tires and the manufactures, the problem still persist! Please advice.