The front bumpers are separate, L and R.
The front bumper brackets are identical, but there are two of them used, one left and one right.
The front bumper joint is covered by a stainless steel trim piece.
The bumperettes or bumper overriders were only on USA cars or perhaps an option on Euro spec at the time.These are one piece chrome with a rubber insert in front, and two vinyl or plastic pieces that cover the edges to prevent metal to metal contact.
There's a wealth of information in our technical manual available to Full Members.