If i remember correctly the entire rear light assembly must be remove in order to access these bulbs. This is true if the license plate is on the trunk. If this is the case then there are nuts on the inside of the trunk that must be removed.
Unfortunately, there is no access to the back side, even after removing the entire rear light assembly. It's all sheet metal with a tiny hole in an awkward position that doesn't line up with the back of the license plate lights. My little fingers don't even fit. I guess the best I can do is either try to get something under the light cover to pry it up as I try to unscrew it or try to drill out the screws/bolts (if I can get the angle). I do not want to get pulled over a fourth time! ??
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I think you are right because I cannot take off the screws either. They just turn round and round without backing out at all. I tried taking off the whole back assembly once before but couldn't get access to the bulbs. I am going to try once again. I must have missed something -- 97 LeSabre
Fig. 8: Twist the socket counterclockwise to remove from the housing
Fig. 9: This type of bulb simply can be pulled out of the socket for replacement
To install: 
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Is it stripped?
I cannot get behind it to see if it has a nut or is just screwed into the molding. There is no access to the other side
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