In your picture, there are 12 bushing pieces. 6 upper and 6 lower. These are for the 6 cab mounts.
For additional hardware, I usually go to an industrial fastener supplier in town. They have hardware that you won't find at a home store or auto parts store. On my 3rd gen, the bolts were M12 threads. I didn't record the lengths. But you can measure and figure that out. You want metric grade 10.9 or higher.
This may or may not be helpful. I focused mainly on removal of the old hardware, since that is usually the difficult part. You can skip through it and see some of the assembly near the end.