What do you mean 'strut bushing'? On the vans, the strut bolts directly onto the knuckle. No bushing there. What we see regularly are noisy sway bar bushings with the occasional loose sway bar end link. And I have seen a strut bearing or two bad over the years. Loose sway bar bushings can make a very loud knock or clatter that sounds like the front end is about to drop out from under the van.