Coolant flange seal 1.3

Yet another bodge on my mk1 was the stat and coolant flange. 

So the I've got a new housing and stat. But can someone point me to the right seal I need please? Stat didn't come with one, and the oring I purchased didn't look like it had a hope of making a good seal. 

Possibly this one. 

https://www.ebay.co.uk/itm/404637049279?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=ixIvKZOgQN6&sssrc=4429486&ssuid=du1r6JIjQdK&var=&widget_ver=artemis&media=COPY