The '83-'84 Thunderbird taillights are different from the '85-'86 taillights. The difference is this:
'83-'84 - Reverse lamp in center of taillights.
'85-'86 - Reverse lamp on inner edge of taillights.
I don't know if the hookups are the same and if you could change the lights using the same sockets (just in different places), but I THINK the fit should be the same.
Rick
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