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That looks like a Thunderbird/Cougar remote. I have one too and I'm going to try to see if it will work as soon as I figure out whether my Explorer has the keyless module already in it like my Cougar did.
That remote should work fine as long as you program ALL your remotes at the same time. I have the identical remote for a spare and although it looks different that the regular 3 button remotes it works fine (as long as your truck came with the keyless entry option, that is)