My first question here:
I KNOW there is a thread here that gives the correct part # and brand for upstream O2 sensors for a 1999 XK8 VIN ... CO38835. I have seen it recently but after a LONG search cannot re locate it.

I know I am new as a REGISTERED member now, but it seems I cannot phrase a question that the local search engine deems worthy of an answer. Maybe a hint would help?

Also, I have seen it asked herein, but never answered, wouldn't there be a FAR CHEAPER way to source an identical O2 sensor under a Ford -- or other brand -- part number?
And yes, I am ANOTHER victim of the cheap, eBay "correct sensor" misinfo; twice! Jus' sayin.'

Hep me, hep me?😰
Pepper