[s-cars] OE replacement tail light vs OEM tail light?

[JR]

I need a new tail light and found one on the thepartsbin.com.  It is OE 
replacement and not OEM.  Anyone have any experience with OE replacement 
lights?  I don't want to buy one and have it fill up with water the next 
time it rains or fade to pink after a summer or two.  I also don't 
believe in putting the Audi dealership owner's kids through college by 
paying triple, but will if I have to for a functional part.

Thanks,

JR