This is a pair... of body to tail lamp housing gaskets in  Rubber.

(A)... they go from the Housing of the tail lamp to the Tail Light Panel.. (NOT the LENS to Housing (B) Both of these are made by  OER brand - USA but not necessarily USA made.

There are two types of these available..

(A)  a  cheaper decent on one made of cork  (# PW210614J)

(b)  a  bit dearer rubber set.

Your better off with this rubber  set to be honest - the closest to the original you will get -  but cost a bit more.

Best also - either way...to use some sealer like selastic to fill the micro gaps that may let in moisture over time.

 On this gasket it does not matter if its RS  .. one long red lens or Std with a red and a clear lense.. its the same gasket that goes to the TL panel.