You know there are 2 different style beds for 87.
4x4's and SR5 trucks got the American version bed and basic trucks got the Japan version.
The Japan version has a lip at the top of the bed and external hooks externally and just below the lip, American versions were smooth sided all the way to the top of the bed rails.
Japan versions had lots of corrosion issues so many of them didnt last and their rare now days.