I began by leaving the stud in place and one of the other screws would not go in......and in my shanker means, I actually messed up the bolt nutsert threads on the inside. So, after a huge fight, I removed the stud. Then, I could see that the round lower section of the new box, was hitting the frame. I used a grinder to try to just touch up the frame....no go. So, then, I got serious about measuring the situation, and found that the box needed to move upward about 1/8. And, I found that the stud hole was the worst offender. So, again, the grinder.....actually, a dremel with a carbide. I lowered the stud hole that 1/8, and the others about 1/16, and voila.....all nice again. Howsumever, I did have trouble with threads on the one insert I screwed up....and it would not tap, very hard I think. So, I used a bit shorter bolt that got about five threads, grade 8, and am happy. I am thinking that most stresses are shear and less tension, so in my pea brain, all is well with the world. That is my story, and Im stickin to it. One final point I will address. Due to the close confines of the box mount, it is VERY difficult to ascertain that it it SEATED. So, a lot of attention here not to just try to pull it down when cocked and not seated.....you can see the inside seat, but not easily....make sure it seats before trying to pull it down.