Number of O2 sensors with Part Numbers?

Can one of your experts kindly let me know : How many O2 sensors are installed in a 1990 420 SEL What are their Part Numbers What Brand to buy. Will a generic Bosch sensor work - with wiring and connector spliced in. Where to buy from Thanks in advance

Can one of your experts kindly let me know :

1. How many O2 sensors are installed in a 1990 420 SEL
2. What are their Part Numbers
3. What Brand to buy. Will a generic Bosch sensor work - with wiring and connector spliced in.
4. Where to buy from

Thanks in advance

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