This being for a car with trim, it mounts to the top of the inner sill at the b post, not to the floor like i suspect yours does? It just doesn't fit well in my car, and it is a 1982 base model shell, no sunroof, and without the many holes you get under the bonnet on the inner wings on later shells, so may mount o,k, in a later 5 door shell?
Either way, it's not right in my car, so is up for sale. The pics will tell the story.