so, can't i get exactly the same ones with stock ones? I could not see their model number, all I know is the brand is bose1991-1992 LS ------ Bose
The Bose system uses the 2100 model AM/FM/Cassette tuner and an 80Wx4 (peak power) amplifier mounted behind the rear seat. The Bose speakers in this system present a 2 ohm load per channel, which the OEM amplifier is equipped to handle.
Replacing speakers in the Premium system
There are several brands which make 2 ohm speakers. The ones I know of are Soundstream and Image Dynamics. They can be difficult to find. The other option is to simply use regular 4 ohm speakers. The volume of the 4 ohm speakers will be half of what it should be due to the mismatched resistance. If you replace only the fronts, or only the rears, you can use the fader to compensate for the difference in volume between front and rear.