oxygen sensors
 

I am looking online to buy oxygen sensors for my 01 3.0i X5 and found there are couple version of Bosch sensors. They all said direct OE but they look completely different from each others. I wonder whoever had bought the Bosch sensors can give me an idea of what to get. I insert a link from the website so you can see them and get an idea of what to get.
Auto Parts World - Oxygen Sensors
Thanks

ALX5

Buy through amazon. You can select parts for your car and it will return the right part numbers. I remember paying 60-75 for a Bosch sensor

They are a PAIN IN THE A___ to get out, you need the special socket, lots of penetrating oil and a whole lot of swear words to get them out.

I just go to O'reilly's or Auto Zone or Advanced Auto parts, tell them your car info, and tell them you want Bosch OE direct replacement. They will order the part if not in stock. I did this for both pre and post. I did buy PB Blaster (spray can like WD40) penetrates the area to loosen it. After driving home, let the car sit to cool off then spray generously, repeat for 2 consecutive days. Then took a open ended 17mm wrench I believe and it came off easy breezy. No special tools. No swearing, mine is 4.4i 2003.

thanks for the suggestions guys. Where can I buy the PB blaster?