Poking at this more, I found the "E" version is the generally normal one. The "F" version seems to be for S8's. Also listed on Euro EKTA as being used for the armored D3's.
Then I started noticing the cross fitments to the C6 A6. Okay, so then I figured I would check the C6 RS6 (the unobtainium one in the US). It came up with the "F" version again. Between that and the armored reference, about enough for me to decide when the time comes again, I will probably use the "F" variant.
Well, then I tried one last Google search and found this: http://cn.oemol.com/oem/oem_detail_s...407505F&lan=en
That's when I realized, again, holy ^&$%, the D3 control arms really do cross over to the #1 Audi sold in China, the A6 and particularly the A6L. Even better, how about the "become a supplier" link in that web page I linked? Truly scary. Thus, to my mind confirmation to be really careful with any non Audi sourced control arms. They are used in China and presumably then aftermarket supplied as well, including eventually perhaps by "become a supplier" mysteries. Thus, as I already had decided after my C5 A6 experiences with "Meyle" parts that conveniently had no country of origin markings on them anywhere that I could find, my future suspension component purchases continue to be from Audi dealers, or at most if I ever saw them actually available here, a confirmed Euro OES supplier like TRW.