^^^The striker and plastic bushing come as one piece, but it can be had at any local parts store that has a HELP section. I paid $6.99 each for mine.
Yes, the doors need to come off to replace the bushings. It isn't really very tough at all though. 6 or 7 bolts per door ( don't remember exactly) and if it has power windows &/or locks you need to fish the wiring out of the door before removing said bolts. Once the door is off, just cut the pin in half with a cut off tool, saw zall, air saw (you get the picture) and pop the upper piece out of the hinge...the lower piece will just fall out. This is MUCH easier than trying to beat them out with a hammer, and plays less havoc on the hinge assembly. Next, knock out the the existing little bushing and just replace in the opposite order...minus cutting anything
