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73-79 tailgates are the same, I have seen earlier ones on the trucks also. I have even seen 70's tailgates on 80's trucks. You should be able to get it to work.
What the last two guys said... It will fit. The body lines are close, but not the same. Most people won't know if the color is the same as the rest of the truck. I had a tailgate from a '70 on my '79 for years. I finally found one from a '73-'79 truck to replace it with.
I ran a 72 tailgate on my 75, the only difference I noticed was the top along nerar the handle had a body line that stuck out rather than flush.It worked just fine, and looked ok too.