No, that is not the Citroen number.
I was in a good mood today, and did some research on this, because there is still no solution I presume.
At the moment I bought my 2.2 I found my left seal was leaking very slightly.
I went to car-joy to buy 2 seals in case it would be getting worse.
So far didn't use them.
If I look closely it is aftermarket aziatic stuff.
It has the number piantk 1028
This number did not ring a bell on the internet, so I looked at the partslist for the Murena.
Here you can see it is Peugeot number 3010.14
I found a website that give info on this number.
http://www.ls-autoparts.com/Artikel.asp?Item_Number=15013000&Parts_manufacturers=AJUSA&FazTyp=583e3341e8ad0ca3cfcf930bf70c1da8&Sprachnr=1Here is info on sizes.
Aussendurchmesser [mm] 50
Innendurchmesser [mm] 35
Breite [mm] 8
I compared the sizes with the 2 I have, and they are the same.
So the seal is also used in a Peugeot 205 83/87 on the cam and big end.
No problem to find I think.
Look at the website I provided.
They are used in a wide range of car.
Ajusa number 15013000
O rings I have Matra numbers.
No research done in this yet, but they look very universal.