The Becker stereos were standard up until 2002. Your Bose system is a MOST fiber optic based system and is not backward compatible. There would be no need for you to pursue that path in any case.
Most Becker 'upgrades' involve replacing a 4 channel amp with a 6 channel amp, adding rear speakers or in some cases adding door speakers.
You can always upgrade your stereo but you will not be reusing any of your current system (other than speakers possibly).
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