I had no answer for my friend.

Why does an Impala Sw have two taillights each side, while other NON Station wagons in the Impala series have 3 taillights each side ?

Because the inner workings of the wagon tailgate (window regulator) needs the room and the third tail lamp woul be in the way.

Thank you, Gene.

Hope all is well with you, now that we have reached maturity into our senior years.

Be safe.