Going on your number Bruce this one according to the details should fit the bill at a similar price to the one you found. I have never had to change one yet so no first hand knowledge.
Thanks Richard that looks as though it should do the job will probably go with an upstream filter and do away with the downstream.
Bruce 1964 4/4 Series V Comp (Megan) 1994 +8 (Maurice) tis no more 2013 M3W (Olga)