Posts #91 and #448 were my go to.
I have a 1987 325es, CM5907, premium sound, fader in dash (6 wires), and a stock amp in the trunk. Went with a Continental TR7412UB-OR, bypass stock amp/repurpose fader wires, rewire fronts/tweeters.
Please let me know if you see something I did wrong

https://www.youtube.com/watch?v=lXYdEnJJVnU
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