All the parts stores are the same crap. You have to saw off the studs. I’ve used the Mighty Mounts because the won’t break. You may have to cut some off the studs to keep it from hitting the block. I can’t remember. They are not cheap, for sure. Unfortunately, they don’t fit the k member any better than the cheap repops. You have to grind down the part that sits on the k frame or it will not sit flat and you can’t get the bolt in place. It’s not a fun lesson when you get to the end and then realize you have to start over. Fit the mount to the k member first. It’s sad that most repop parts now are close enough to use but not a direct easy fit. It’s like they do it on purpose. I installed a set a “Metro” door panels on a Challenger the other day and as good as they are, they still have shortcomings. They are too short at the front of the door and don’t line up with the top screw very well.