The pull-up bar arrived with no guide for installation but instead there was a post card that had a code and I needed to go to the webiste to look for it. A problem was that the code could not be found with a search on the website. I was able to install it without the documentation and to do so I removed the T-2 pullup bar and loosened the two side cross pieces to slip the new pullup bar into position. Not necessary to use M16 bolts to attach this and these require a 24mm socket which few people will own. Six M12 bolts provide a shear strength of 6800 pounds or more than enough.