I have 3 complete jeep TB's. They are 60mm and a bolt on. My TB's come with a gasket and a plug for the little hole.
The gasket is custom cut.
The plug is a vac cap that fits perfectly and you use some silicone to hold it in place.
The TB is completely moded for 2gnt. Both sensors are included and all modifications to the TB are complete.
To Install all you do is: 1)Bolt it on 2)Plug the little hole with the plug provided 3)Adjust the throttle cable on the manifold 4)Hook up both sensors and your all set.
I have had mine on for about 7 months with no problems. This is a great performance mod.