Could anyone help me identify how a radio will have Aux Input based on the Part Number?

I found this one on ebay;
Radio 05 06 07 08 BMW X3, AM-FM RECEIVER, CD PLAYER - eBay (item 220752549917 end time Apr-09-11 14:05:35 PDT)

my X3 is an 2005 as well... i'm guessing it will physically fit. it would suck to buy it just to find out its the same p/n as i currently have.

thanks