I have the Ford DuraLiner bedline, and the third one that was installed on my truck (finally) fits very well. The dealer had to toss the first two of them due to mfg defects.
If you get one, make sure it is actually rectangular.
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Regards,
Gordon
99.5 Red Lightning,
$10,000 worth of mods on my list, and an unenthused wife who is still not convinced that we really NEED them.