In order to use Defender door seals on a series land rover (SII, IIA & III) the lip which forms a channel for the original type door seal needs to be ground off before the Defender seal can be knocked on, otherwise the gripping will be spread open too much and ruin the seals ability to grip.
Old Land Rover part numbers, i.e. 608464, now has a prefix 'R'. In order to use the search above, type in the Prefix followed by the part number, no spaces.