Hi guys, I've been lurking on this forum for a little while but this is my first time posting! I recently got a 2005 3.7l Liberty. I've done some light maintenance on it and the O2 sensors are next on my list. I've seen some mentions that the upstream and downstream sensor are the same part on this particular engine but I wanted to confirm that before ordering. Can I order 4 of the same sensors for this vehicle or do I need to order 2 upstream and 2 downstream? Thanks!