On the shocks it will really depend on the type of use. If there are no leaks, give a good bounce on the front and rear bumper. Shouldn't bounce more than about 1-1/2 times before stopping. If it keeps bouncing, it's time to replace the shocks, even if there are no leaks. If there are signs of leakage, it's time to replace.
Wheel adapters aren't really a wear item if they were properly installed, and then re-torqued 50-250 miles after install.