I just bought a 1996 4wd Pathfinder, when I looked at the shocks I saw these on all 4 coils. It does need new struts and shocks should I keep them on, the ride is not that bad. Or are they dangerous? They are made of some type of hard rubber. Also, I noticed that all of the Pathys I see are missing the center wheel caps, whats with that? Do they just fall off or do they corrode and people take them off?