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Hey everyone, hope a great new year is in the works for all of y'all.
Question about o2 sensors. I want to replace all of them on my 99 s500 (w140). But I'm confused about model numbers. When I look it up some say front left or front right or downstream left or right. But they have the same model numbers. Regardless of what side. Why is that? Same thing when I looked at cats on magnaflows site. It listed a front right and front left cat but when I add to cart it is the same model. Any clarification will be helpful. I'm really hoping I can slap on the same o2s for all the bungs.
 

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1994 s600 coupe
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pretty sure those o2 sensors are the same from around 1990 to 2012, the only difference being the plug on the end.
 
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