under the steering wheel on the left side
Under back seat.
it has 250 horsepower
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On my 99 SSEi, it was located on the passenger side just in front of the rear wheel.
With a Hammer
http://www.modifiedlife.com/1993-pontiac-bonneville-car-stereo-wiring-schematic/
The wheel bolt pattern is 5x115
The 1994 SSEI is on the overhead counsel.
There are two oxygen sensors, there is one located in the exhaust system before the catalytic converter and one after the catalytic converter.
The most common reason for the harmonic balancer breaking on a 1994 Pontiac Bonneville SSEI is the inner and outer mass is breaking the balancer down. This happens because your engine is running rough or too high of RPM's.
There are adjustinf screws on the top and sides of the lights. I like to get on a country road at night and adjust them like I want them, careful not to blind oncomming drivers.
my 1992 Pontiac Bonneville SSEI has speed control and it is located on the blinker control switch on the end you have to push it towards the steering wheel it is a little button on the top then to set it you have to push it in more while holding your speed. It works as low as 25 mph. I have found that mine does not always work because my car is 16 years old. I hope this helps you.