Dan,
The 'hose' like seal 000 184 3380 seals the filter element on the filter head. With the filter kit, you will also get a large 'O' ring which seals the filter bowl with the filter head. Be sure to remove the old one! You should fit only one of the 'O' rings.
The 000 184 1780 is the 'donut' like seal that goes at the bottom of the filter bowl. While you are at it, its a good idea to change this one as well (unless its been recently done?).
Hope this helps.
naj
65 230SL
68 280SL