Hi Jack
If you have any of the original seal that allows you to see the profile then these people may well be able to help. You can also download their useful chart which has many profiles on it allowing you to select the one you think will fit.
http://rubbertrim.co.uk/download.php
I have used them from time to time for over 40 years and they have found me everything from windscreen rubber for a 1942 Dodge Ambulance to all the seals I needed for an Austin Healey 3000.
Good luck
Paul
Paul Barnard