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I've tried to find a parts place that would not have too high a shipping price and it was hard to find a place that would ship internationally. I have a friend who has used this source for parts, and they have relatively good prices and they say they have a way to ship internationally. Have a look.
I've seen prices a little bit lower, but none of the sources offer international shipping. That's the catch. If I see any other sources, I'll let you know.
fwiw: I would try one out of a junkyard, bosch, from another vehicle with three wires. There is very little difference between models except the harness connector (when splicing remember it has to breathe).
Go to the Electrical Systems / Wiring thread. tell them what year and engine your Bronco II is and the year and engine of the Explorer and what you want to do, They will tell you if it's possible and if so, how to do it, and if not, they should know what will work. Also try your question in the General Automotive thread as there is a member here named Number Dummy who has information about parts used in your Bronco II, and interchangeability (what other makes' parts will fit your vehicle) and can help you with identifying and trading parts. Good Luck!
The 4th wire is the pre-heat wire for OBD II. All 02 sensors are basically alike and all put out about the same voltage and use the same bung, the main difference is the vehicle connector and the length of the wire.
A Bosch universal will fit a great variety of vehicles. The early Ford/Chevy are very much alike.
Not an issue in Europe when it is probably the only choice. I don't think ngk (whatever the Japanese one is) sells them in Russia. Plus, I never had problems with Bosch.