[RickM]

Looks like the 0 450 905 016 works for years '74 - '79(perhaps '80 as well). Here's a thread on the subject. http://forums.pelicanparts.com/printthread.php?threadid=83046&perpage=20&pagenumber=1

Seems one filter has an inlet of one size and an outlet with another. ..as opposed to an inlet and outlet of the same size.