Where can I find body plugs???

The kits are usually missing a few. The large one in the spare tire well is one that most kits don't come with....some do. The oval one for the clutch linkage does not come in the kit and Im not sure anyone makes it.
There is also an oddball size one above the master cylinder that is hard to find. This one is usually damaged or missing because its a convenient place for people to run wiring through.
You can find most of them in small qty on ebay. They cost a little more but better than buying a whole kit for one plug. Those kits have gotten ridiculously expensive.