They do become very brittle over time. I put them in almost boiling water for a minute or two to help the plastic get a little more pliable. Then insert thin/small flat screwdrivers to open up the sides a little (this is the "Be VERY Careful part"), one to each side and leave them in, then a larger pry at tongue opening to slowly lever cover off.
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69 SS 350 convertible (in peices)
69 327 convertible (driver)
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