Thermo Sensor HOUSING seal?? O-ring?? Copper Ring??

[230SL]

I have been trying to find a picture of the housing so i could explain this and see visually but of course look for something and you never find it.  I am looking to see what seal,o-ring, cooper seal goes inbetween the thermo sensor,temperture sensor to guage sensor HOUSING and the screw attached to the engine block.

Hope this works its is # 84 in the diagram
Picture
http://www.sls-hh-shop.de/index.php/cat/c3_Mercedes-Benz-230SL-250SL-280SL-Pagoda--R113-W113-.html#cat_79_position_84_prod_0

Or this one its the 2nd photo down and the Housing is to the right of cylinder 2
http://motoringinvestments.com/T116photo3.htm

Housing is to the right of cylinder 2
http://www.ritzsite.demon.nl/280SL/MB280SL3.htm

[wwheeler]

The housing uses a metal seal ring (#007603 030101) and the bolt that secures the housing also has a metal seal ring (#007603 010112). The housing is a 30mm ID and the bolt is 10mm ID.

[230SL]

The 30mm copper washer seems to be for the screw that attaches to the block because where the housing mates with the screw is 27.8mm Approx. OD.

Using the first link as a reference Number 83 the screw which attaches to block has a 30mm copper washer which in the picture has no number and is in front of the screw.  The 84 however outer diameter according to my caliper measures out to the 27.8mm OD