When driving between 95 and 120 there is a vibration on the seat?

If you have not changed out the CV axles this could be the problem due to worn out CV joints. Please check out this guide and see why this could be the cause:

https://www.2carpros.com/articles/how-a-cv-joint-works

Here is a generic guide to help you step by step with instructions in the diagrams below to show you how on your car:

https://www.2carpros.com/articles/replace-cv-axle

Check out the images (below). Please let us know what happens.