Do yourself a huge favor and replace those sway bar bushings stat! You'll be amazed how much better the van will drive when the sway bar is actually working. It may not look like much, but the amount of swear in your rubber bushing probably translates into several inches of body roll before the sway bar even starts to work. That extra body roll at the front axle affects steering, so you should find it tracks straighter on the highway.
The MOOG polyurethane bushings are much stiffer than the OE rubber ones, plus they never wear out.
Be carefull when you order. MOOG (and others) also sell a steel-sleeved rubber bushing, which is the same as stock. Parts store catalogs rarely say if its rubber or polyurethane, but they will say if it comes with the steel sleeve. You want the one w/out the sleeve. It should look like this:
Best way to take out the originals is hitting them from the front with an air chisel. I've wasted an hour+ trying to press them out, only to find the air chisel only takes a few seconds each.