THE FIX IS IN THE SECOND COMMENT.
IDK if this already a thing, but I think the IX kits are different between 2 door and 4 door. If you look closely at the 4 door, the trim ends short on the rear door and the cut out for the trim on the rear flare is for the lower body line which would line up with say... the lower M3 box flare body line.

If you look at the 2 door, the cut out would be higher on the flare, for the trim piece on the quarter panel itself, which is longer.

My car. I think I have a 4 door IX kit for my 2 door.
IDK if this already a thing, but I think the IX kits are different between 2 door and 4 door. If you look closely at the 4 door, the trim ends short on the rear door and the cut out for the trim on the rear flare is for the lower body line which would line up with say... the lower M3 box flare body line.

If you look at the 2 door, the cut out would be higher on the flare, for the trim piece on the quarter panel itself, which is longer.

My car. I think I have a 4 door IX kit for my 2 door.

Comment