1957 Oldsmobile under dash Manifold/diffuser for any 57 Oldsmobile with Air Conditioning. This is a 1 year only piece. This is more than rare it is impossible to find! I looked for over 6 years for a piece like this and then when I found one it was a mess. So since I am restoring 57 Oldsmobiles with air conditioning I had an a few extra ones made. This piece is made out of formed plastic not card board or hard board and fits perfect. Includes are the metal clips to attach both to the upper dash and back of the dash