I have a 7.2 FX also and tried mounting a rear rack today. I have the very same problem that's gotten even worse. I couldn't get the stubborn things out using a screwdriver and small pliers so I came here, saw your thread and took your advice by lightly tapping from the opposite side with a screwdriver and hammer. I was able to get the cap about a third out when the top broke off! Now I have a plastic-filled bolt hole and I can't imagine a way to get that out. I stopped working on the other side as soon as saw the plug begin to separate. First of all, what's the point of making these little plastic caps so darn snug anyway? And second, how the heck does one get them out? Great bike but this little plug is a pain and only causes excessive cussing and paint scratches. Ugh. Frustrated.

Thanks in advance for any advice.
Here are some pics: