This seller is a little funny. Firstly, front and rear rims OEM are different sizes. Next, look at this picture from the same seller and look at the rim body... notice the differences between the two (and this second more costly is supposedly OEM as well). I think the second bead on rim is what sets the two apart when running ROF.
And on the inner rim, you'll see the oem has a ridge on the back of the rim, the "supposed OEM" is flat all across. When I clean mine, I can feel the rear ridge. Something to think about.....
OEM Factory BMW 20 in LA Y Spoke 214 Wheel Rim X5 71179:eBay Motors (item 170286955840 end time Nov-07-09 13:24:59 PST)