All of it is a direct swap except for the rear center section which houses the license plate then the center section of the '89+ full across brake light lens. If you're keeping your pre89 taillights you;ll have to make due with the center section being different or hack, cut and paste from the '89+ piece onto yours.
To fit the '89+ section on the pre89 there's one or two holes to be drilled and you'll need the lock.
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