I pulled it out of some old wrecking yard stock so I am not sure exactly what it came off, but it measures 51 and 5/16 by 17.5, Located in West Kelowna British Columbia
Not a 1980 like this,look at the TOYOTA size difference, these are 5 inches tall.I think the 1979-1983 was the same.
I think what he has is a 72-78 tail gate. Ive seen 2 different tailgates for the 79-83 models, one with a small dip at the bottom of the TOYOTA letters and another with the dip above them