All I can tell you is after fitting BOSCH plugs bought from Hellfrauds that two out of the 4 were leaking and missing terribly due to this, within 100 miles, they were totally streaked all around the porcelain, upon enquiring with others found it was not an isolated case, I put NGK in and no problem, though I'm sure ford would have been ok too.
I had fitted them to some other zetecs but these took longer to play up, but the odd one did so.
tabetha