I had to get a lawyer once with a dealer. The lawyer absolutely annihilated them. It was very satisfying. They are scum of the earth. Good call on not responding to them saying you did something.
The Brey Krause side mounts bolt straight to the floor. Also have a nice six point addition that you can purchase separately.
Here is my setup. Straight to the floor was a little too low for me (i'm around 5'9") so I purchased Macht Schnell floor mounts to raise the seat a little...
They make a horrific sound on the street. Yes, I know track pads do this. However, the PMU's work well for me on track and have excellent street manners, so since I know there is a pad that works well on track (for me and the tracks I go to) and doesn't make my car sound like a trash truck on...
Same size? 275/35/19 or something else?
That is 1000% an alignment issue. Toe is way out of spec. Any abnormal tire wear is always an alignment issue (or a parts issue that is causing weird alignment issues).
Here is a list of things people should do when the car feels odd, or you have odd...