Rightyo,
Just got back from the local SupaCheap and you don't wanna know the stories so that I could get my hand on a plug chart. Got in & got out quickly so I didn't push the luck; here's what I found out.
The plug recommended for a CX Citroen was an NGK BP6HS
Now they didn't have a comparison chart for our Eyquem brand but I have found in the service manual that the CX Citroens take a 705S and these plugs of jr's are shown as a "JS" so I don't know it therte is any difference. Maybe someone can find out.
If they do turn out to be the same as the NGK BP6HS, then they are compatible with:
ALL CX's
All D's
Renault R-12 and Virage
Renault R-15.
If they are close enough to be good enough, to a BP6ES or BP6EFS in NGK, then they will be suitable for the Peugeot 504 & 505 as well as a couple more of the Renault range.
Hope this sheds some light. I can also post a website but it is in Danish but apparently it is understandable and shows these brand as well as others as individual as well as 4 pack in parts numbers.
Here is the message I got from a guy in Denmark; hopefully you are a bit more computer literate than I and can get it to a readable size.
Alan,
It appears that the info we need is there.You do not HAVE to mail me, but of course use the Biltema site :
Click "Katalog" then the yellow section "Bilreservdelar". Then choose reserv_2.pdf for download. This section contains the spark plugs tables.
It's all in Swedish language as is the company, but price tags are converted to danish currency.
To compare prices, just divide by 12, then you get accurate prices in UK£.
C U
Link:
http://www.biltema.dk
Here's hoping this solves it.
A very

Alan S