Just to let you know these parts were used on the following models -
80/80 quattro '85-'87
Coupe '81-'88
Coupe quattro '85-'88
Also quattro '80-'91, but there are 2 different versions on quattros I believe. So best to stick to ones from the above 3 models,
Part numbers are -
Left Upper = 857 853 835a
Right Upper = 857 853 836a
Left Lower = 857 853 841a
Right Lower = 857 853 842a