Yes , James, if you will... 
My recollection is, these where mentioned mistakenly by somebody who thought they where the genuine article. They are not.
"Greiner" is marked on the oe items.
Personally, given coil pacs are £70 to £120 a side if it all goes tits up, I really don't think it's worth the risk.
Chris - my recollection is the same as your re "Greiner" on oems - but my recollection re James was that he had found a non-oem V6 cam cover gasket that seemed to perform as oems (and was cheaper) - may have been Elring one, not 100% sure.
Personally I support the recommendation re the use of OEM V6 cam cover gaskets and o-rings (use 'em myself), just get miffed at the way some of the senior (or "junior" in this case) members try to give the impression they are better than other members and talk down to them (look for the post where spelling mistakes of a dyslexic member are criticised http://www.omegaowners.com/forum/index.php?topic=102207.0 - Juvenile at best!)
Will wait for James to comment re the gaskets - may be a cash saver
Dbug, if I coud be bothered to look, I'm fairly sure I coud find similar abruptness from yourself. Learning difficulties or not, cash flow difficulties or not, the advice stands. As you've just said. How long ago was James's post? More than 90,000miles ago? Then how can he know they will outlast oe? ( assuming we accept oe last 90k, just an example)
Ralph has, IMO, taken some delight in bating members here, and shouldn't be too suprised if people loose patience... IMO.
But then, that's forum life I guess. As suggested, deal with it. It's a forum, with opinions. Some of those opinions are just plane wrong.
Bit like every single possible knock from front suspension can only ever be drop links, and that copper slip causes brake squeal.
