Those are caster correction bushings to help roll back the axle after a lift. They were a good solution years ago but now we have better options (plates, radius arms, etc.). Good you are putting back the Toyota bushings, but you'll need to get some caster correction.
For the starter issues, you should start by checking all your main connections at battery, ground and starter. Ensure they are tight and clean. After that is done and you still get the issue, I'd personally pull the starter and pull it apart and check the plunger and contacts. You can look and tell if the copper electrodes are worn. You can simply replace them with Toyota parts for cheap.
For the starter issues, you should start by checking all your main connections at battery, ground and starter. Ensure they are tight and clean. After that is done and you still get the issue, I'd personally pull the starter and pull it apart and check the plunger and contacts. You can look and tell if the copper electrodes are worn. You can simply replace them with Toyota parts for cheap.