Stereo Setup for a 1987 260E
All radios today are 4-channel, but OE radio in W124 was 2-channel.
Output from OE radio goes to console fader, then to 4 speakers on your early W124, which are metric sized.
Most new radios have fader built in. You either have choice of running a pair of outputs to the console fader or figuring out how to separate the speaker wiring from the OE fader and connecting it all directly to the new radio. There is a blanking plug available should you decide to bypass oe fader.







