The only difference between grade "A" and grade "B" on this part is the reflective finish on this grade "B" part needs to be redone. There is a spray paint specifically for this application sold by Krylon and others. The pair you get will actually look much better than what is pictured here.
*NOTE* Need help diagnosing a Cougar turn signal problem? Victor Yarberry is the world's most knowledgeable expert on the subject. Vic has owned Cougars since the 1970's and is the designer of all of our solid state sequential systems. There is no question he cannot answer! Here is a link to a great source of information on the subject.
Check out this LED Comparison video