I replaced my rear light harness (along with all the others) and it comes with exact copies of the OEM sockets. Nary a problem. You might want to considered replacing the entire rear light harness (45 year old wiring anyway) with one of the excellent reproductions from M & H or American Autowire,
^^THIS^^^
My car did the same thing and I replaced the rear harness with a M&H harness. EXACT COPY OF THE FACTORY WIRING. I have used M&H harness for the rear, engine and front harness and they all are perfect.
