You need to get a diagram or op manual. You are missing some parts. They were made to fit multiple models, B, L or M series tractors. The top link is different and depending on your tractor is which lower holes the lift arm mount. They also have hardened pins for the top link as well as the heavier plate Wolfman mentioned.
They are or can be hard on the 3pt lift when you have all the needed parts. No way I would use it as is but that's just me. It may cost a few hundred to get the needed parts but remember, you're sitting on top of what's missing. I don't want to hear about something breaking and one of my orange brothers ending up with a top link wedged in his a$$ crack.